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Not using the following:
1. Adamantine ignoring less than 20 hardness.
2. Imp. Crit and Keen not stacking, though I have modified the keen and vorpal powers so they don't give as large a bonus.
3. Inv. and Greater Inv. (aka Imp. Invisibility) are back to their former durations.
4. Death Ward is back to its former duration.
5. Stoneskin, Prot. From Arrows, Iron Body spells and Golems all have #/- DR. #/Adamantine DR does not exist in my games.
6. Rangers receive bonus feats, not combat paths.
7. Change falling damage to cumulative and additive damage, so that people fear falling great distances. I wish they would make this change in the core rules.
That's it I think. All my other rules are pure house rules that aren't in any books that I know of.