-The bard needs to be reworked to be a character class playable from 1st level. He should have druid spells primarily, but I can see including a few appropriate things like charm person or command.
-Weapon Type vs. AC needs to be cleaned up. I do want to use it, though, to make weapon choice matter. Also, Trollsmyth's recent post on the Warrior's Kit has the wheels turning in my head. Maybe something similar to 2nd edition's table.
-Option on all weapons rerolling on max damage, with crossbows or similar weapons penetrate on max and max-1, so they'd reroll on a 5-6 on 1d6.
-More language diversity (not one common tongue, generally)
-Option on social class for characters, possibly imported from Oriental Adventures or Hackmaster
More as they occur to me, and I will post my solutions or rethinkings as I tackle them.