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So I feel that a good indication of what will work for 5th edition is what worked best of previous editions comined with imagination and a few new ideas.

But how do the developers know what worked as a whole? I think we should all list the books that we've enjoyed over the years in various editions.

(Sorry if this has been done before, searched back two pages with no results)

If you wish to, put reasons by the books, but if you just like the whole book then just list it.

Me:

3.0 Monster Manual I/II - I really like the desriptions of the creatures in these books. The art wasn't bad either

3.5 Expanded Psionics - this system for psionics was interesting and I liked how it didn't use spell slots

3.5 Draconomicon - The art and detailed descriptions of the ecology of dragons made this book for me

Tome of Shadow (even if it was underpowered and truenamers were just poor) - I really enjoyed the Binding and Shadow magic sections of this book. Both were interesting concepts that were never fully explored in 4e

Tome of Battle: the Book of Nine Swords - IMHO, this books class mechanics were better than the entire of 4th edition's class system. I know it was the basis for the power system in 4e, but I enjoyed playing Swordsage more than any 4e class.

Forgotten Realms Players Guide}
Ebberon Players Guide                   } - the major successes of 4e IMO. The players guides were very well done
Dark Sun Players Guide                }

excluding third party material:
-white box
-b/x set
-becmi sets
-rules cyclopedia
-1e phb
-1e dmg
-1e unearthed arcana
-1e oriental adventures
-1e monster manual 1&2 + fiend folio
-1e greyhawk setting
-1e fr grey box and fr 1-6, city system, and kara-tur
-too many 1e and b/x-becmi adventures to name
-gazateers up until 2nd e
-hollow world box
-and every 4e book/box (with an emphasis on aedu classes, although ive tried all the essentials pcs and dont have a problem with them at the table)
-there are some stinker adventures in 4e but they have gotten a lot better over time