I own (in order of purchase):

OD&D;
The four OD&D Supplements (the splat books of their day ;
AD&D;
Basic: Rules Cyclopedia; and
AD&D 2nd Edition.

Have looked at D&D 3.5 Edition and discussed it with regular players of it, but do not own or play.

Why?  Started with OD&D circa 1976-77, bought Advanced well because it was advanced, not basic, it wasn't restricted to level 3, and the MM came out before basic so we were already "locked in."  

Got the Rules Cyclopedia because of all the good things I'd heard about it and really liked the take on gaming of its proponents.  I picked up 2ed because it was cheap, and wanted to see what all the dislike was about.  Didn't think it was bad at all, the format and layout were painful, but otherwise didn't seem so different from 1st edition.

I own Basic/Rules Cyclopedia and 3.0. I've got the Basic/RC because its my favorite version of D&D to play. I'm not really sure why I have the 3.0 books. I always thought I'd eventually like them better than I did, but they mostly just collect dust now. I guess I just hang on to them so I can have a semi-recent version of the game around for whatever reason. :shrug:

Well, I've owned them all.  These are the ones that I currently have on my shelf and the reason why they haven't been sold or traded like most of my RPG books.

-AD&D 1st ed.  Nostalgia.  Seriously I have little use for these books anymore, but I just had so many good play years with so many good people I just can't seem to part with them.

-Moldvay/Cook Basic & Expert.  A mix of Nostalgia and a hope that I will one day be able to run a campaign using these much loved rules.  Whenever I write D&D or run a one shot I use these rules.

-RC.  Sort of a supplement to my basic set.  I really don't care for the RC much, too many goofy rules and such that overcomplicate the beautiful Basic and Expert set.  Still, there are a few little tidbits that are handy to have, so for now I still keep it handy.

-3.5.  Because this is what my group plays.  Now that 4th ed is coming out I'll probably sell off my mint DMG and MM

Will I buy 4th ed?  Sure.  If I GM, I'll be using Basic anyway...if I'm playing I'm going to play whatever the GM wants to run, and I'm sure 99 times out of 100 that is going to be the current edition of the game.

I think WotC is making some seriously flawed decisions with this new version, and my predictions in the RPG industry have been eerily correct over the years...but I could be wrong.  We'll see.

I own the OCE version of Original D&D, a compilation created from the PDFs of OD&D and the supplements (except for Swords and Spells and the parts of Blackmoor I don't intend to ever use), the Holmes Basic set, Moldvay/Cook B/X, the Mentzer Basic through Master boxed sets, the Rules Cyclopedia, AD&D 1 (about 8 books for that), AD&D 2 (the three main books, Tome of Magic and the Outer Planes Appendix), D&D 3.0 (main books and the class splat books, Manual of the Planes and one other), D&D 3.5 (main core books, the book about Aberrations and one other whose name escapes me at the moment). I also own Castles & Crusades and have a copy of Labyrinth Lord on the way. (that was a freebie; I helped with looking it over).

Allen

The last set I owned was AD&D (Player's Handbook, GM Guide, Monsters, Deities & Demigods).  Got rid of them a long time ago, though.

However, I did keep my original Deities & Demigods.  It's the one that includes the Cthulhu Mythos and the Moorcock deities.  I think.  Anyway, the ones that were removed in later printings.

I got rid of all mine a month ago. Freed up a whole shelf for stuff I got from GenCon.

-clash

Let's see -

I started with the Mentzer Basic Red Box and got the Expert Blue Box not much later.

We decided to make the move to AD&D right around the time 2nd edition was coming out, so we ended up with a weird mix of 1st and 2nd ed. books: from this period I have a full "core" set of 2nd ed. books and bits and pieces of 1st ed.  I also picked up the RC when it came out.

I had just started a new, 2nd ed. game when 3rd ed. was coming out, so I never got any of the 3.0 books, but when 3.5 came out I decided to give it a try and picked up a core set.

And I just got the Moldvay B/X books for fun.

So, depending how you count them, I have around 4 separate editions.  And, at this point, I'd be happy to play any of them except for 2nd ed.

Original (in electronic format only) pamphlets.

Holmes basic.

Moldvay/Cook BE.

Mentzer BECMI.

RC.

1st ed.

2nd ed with some of the splat books.

3rd ed.

So at least 8.

OD&D Collector's Edition box (snagged from a dusty shelf during a game store sale) + supplements in pdf form

Moldvay/Cook D&D (I like to believe Mentzer never happened)

Rules Cyclopedia

1e AD&D; all books save Greyhawk, DL hardcovers

2e AD&D; core books, early monstrous compendiums and splats, Player's Option, Core Rules 2.0 + expansion CD


My favorite editions are the Moldvay basic/expert and 1e AD&D.  They're still my go-to fantasy games as I'm comfortable enough with them to tweak to my heart's desire, though I do enjoy other systems from time to time (RoleMaster 2nd especially).

As for the other editions I own, OD&D is basically for the collectible aspect, as well as a fun reminder of the roots of our hobby.  Rules Cyclopedia is great for reference, though I don't use many of Mentzer's additions.  We played a lot of 2e in high school, but everything got too top-heavy, and I really like the tone and feel of vanilla 1e much better.

3e lost me from the start; after reading a friend's Player's Handbook, I decided it wasn't for me and stuck with my old games.  I have an admiration for 3.0 and 3.5 as well-designed systems, they just don't awake that "gotta play" feeling in me.  What I've read of 4e makes it clear that I'm definitely not the target market.

(EDIT again: I have a reprint of EPT as well, which as has been mentioned upthread is pretty much OD&D, only better organized.  I've never played it, though.)

Two; a 1978 third edition of the D&D rules and first ed. AD&D.

Quote from: flyingmiceI got rid of all mine a month ago. Freed up a whole shelf for stuff I got from GenCon.

You inhuman monster!

Quote from: jrientsYou inhuman monster!

Jeff - I'm never going to run D&D again, and I gave the books away to the kids in my gaming group, so if they want to run it they can run it, and I'll be a player. If I want to run vanilla fantasy, I have FtA! and Iron Gauntlets to keep me warm at night. Besides that I have Roma Imperious, Pendragon, Book of Jalan, and Blood Games II (Ancient setting) to cover anything non-vanilla.

Besides, I have no nostalgia quotient, and that keeps me able to get rid of impedimentia. I got rid of 20 years of Dragon magazine some years ago by dumping them in the dumpster. Freed up whole bookcases for games I am going to actually play.

-clash

Quote from: flyingmiceBesides, I have no nostalgia quotient, and that keeps me able to get rid of impedimentia. I got rid of 20 years of Dragon magazine some years ago by dumping them in the dumpster. Freed up whole bookcases for games I am going to actually play.

-clash

Clash,


 A Dumpster??!!???
 Are you nuts? You could have sold those to a place like HALF-PRICE books. With the bucks you might have gotten from them you could have purchased at least two fast food meals.  
At HALF-PRICE Books some other gamer might discover those magazine, buy them and enjoy them.

- Ed C.

Quote from: flyingmiceI gave the books away to the kids in my gaming group, so if they want to run it they can run it, and I'll be a player.

I got no beef with that.

Quote from: KoltarClash,
 A Dumpster??!!???
 Are you nuts? You could have sold those to a place like HALF-PRICE books. With the bucks you might have gotten from them you could have purchased at least two fast food meals.  
At HALF-PRICE Books some other gamer might discover those magazine, buy them and enjoy them.

- Ed C.

Lord, Ed, I'm not poor. I don't care about the money. The "other gamers might buy them" thing is more to the point, but I thought about it and still don't regret the dumping. There's plenty of these things on the market, and they'll find someone else's mags.

Jeff - I'm cool with playing any D&D. It's just not in me to run it any more. 20 years was enough.

-clash