Dwarves got substantially changed; I know the "move normal speed in fullplate" was added, as was the "Stability" trait.

Monsters-as-playable-characters got substantially tweaked stylistically, in that it now spells everything out for you.

As previously mentioned, 3.5 Rangers got a buttload of class features. Their previous class table is about as bare as the Wizard's.

Wilderness Lore and Innuendo got removed as skill, and UMD (and others) can now be trained as cross-classed skills.