Are D&D rulebooks stuck in the 70's?
I too wrote a thread on this subject and I totally agree!
Let's start with the books: why 3+ ?? And then you need a setting too! D20 modern can get it all into one book, as do many other RPGs (like SW, CoC, WoT...) -> 1 rulebook and 1 campaign setting. There's no need for more.
In fact, almost half the PHB is taken in by with spells. We don't need that many to start with. Let's keep it to 5th level (like in d20 modern) and bring out a "Book of FX" to get all the extras. There'd be even place for basic psionics in the corebook (again, llike in d20 modern).
Classes: make them more generic and limit them to 4-5 (warrior, priest, rogue, mage, psion). Now you have enough place left to include a decent GM's section (only basic magic items, the rest comes in the "FX book"). Then include the most important monsters & NPCs and put the rest in monster compendiums (one per setting).
More emphasize on skill use! And I always thought rogues should get only 6+ skill points. And more feats that have nothing to do with combat benefits!
Many times I noticed D&D is still too dungeon-oriented. Maybe you should take a look in the upcoming Dragonlance which has been more story-centered.
D20 tries to make a generic RPG, but it's stuck with outdated topics! Those two don't mix well.

