I concur with Warbringer. Still have all previous editions, most of my older books even still have that first edition smell to them.... the sniff of nostalgia...
What I WOULD like to see, is a special edition book that compiles stuff into a single volume. Think DMG I+II + the DM stuff from books like ELH, EPsiH, UA etc. and even the rules specific stuff from the environment series etc. into one massive volume for the DM, similar for a huge monstrous manual with the MM I, II, III and FF and Savange Species rolled into one, and a massive player tome with the PH I+II plus race series and complete books stuff etc. put together.
That way, I'd have three massive tomes, preferably with larger pages (A3 / B3?), and several bookmarks etc. to fulfill my every gaming need, all rules updated to 3.5.
Now THAT would be cool... and the original 1E coverart, why not...