I have 11 pages of house rules, which is less significant than it sounds. Most of those pages are devoted to some optional classes - minstrel (still a work in progress, anyway), archaeologist (recently posted to house rules forum), and ranger and paladin PrCs. I'll probably use the ones from the AU from now on.
Another page is devoted to sorcerer spell-chaining.
Other rules include minor changes to clarify a few vague spells (resilient sphere, globes of invulnerability, and wall of stone/iron, and a few others), and to make a few changes to some of the spell lists (clerics lose some spells, and druids gain some spells in my rules).
There are a few changes to class skills (Everyone picks 10), and a few changes to feats. There are also changes to how many skill points PCs receive.
There are a host of sundry little things like death at -con, and wizards can take a bonus feat in lieu of familiars, etc.