A sai, that pointy thing Raphael from the ninja turtles uses, deals bludgeoning damage.
A wizard replaces one of its bonus languages with draconic instead of just adding it to his list. A halfling wizard with an Intelligence modifier of +5 couldn't learn elven (for example) if he wanted to learn draconic at 1st level.
When preparing spells for the day, a wizard can leave slots open to be filled later on in the day by spending 15 minutes preparing her mind and then preparing spells as normal.
Spellcaster that prepare their spells (wizards, paladins, rangers, druids, clerics) can always use a higher level spell slot to prepare a lower level spell, even without the Heighten Spell metamagic feat. The spell acts as normal for its level though (i.e. a magic missile prepared in a third level slot without the Heighten Spell feat still counts as a 1st level spell). A spellcaster can do this even if he wouldn't normally be able to cast spells of that level because of a low ability score (i.e. a 10th level Paladin with a Wisdom score of 11 could prepare a 1st level spell in his 2nd level spell slot). Spontaneous casters (sorcerers and bards) do not get this luxury without the Heighten Spell feat.
A wizard can only prepare spells that she has writen down in her own spellbook, even when using someone else's spellbook. She couldn't, for example, use someone else's spellbook to prepare a fireball spell unless her own spellbook has the fireball spell recorded in it. Also, any time she uses someone else's spellbook to prepare a spell, she must make a DC 15 + spell's level Spellcraft check. Failure indicates she can't prepare the spell from that source until the next day.
That's all I can think of right now. Source for all of this is the Player's Handbook and the DMG.