Well, I give out half normal xp for monsters using the FRCS system. (Just switched over about a month and a half ago; so far I like it, though it does just about double the time I spend figuring xp.) I also give roleplaying awards using a fairly simple system- there are four categories: race, class, alignment and personal. At the end of each session each player makes an argument for how they role-played each concern. For each category I award them 25xp/level. You can't call using your abilities "role-playing," either; it has to be... well... playing the role.
For example, let's say the character is Dworkin Darkhammer, a CE dwarf ranger/rogue working towards the tempest prestige class. This game he had a hand cut off by a terrible critical hit! So he calls the following for xp (real character, hypothetical game):
for race- Dworkin met another dwarf. Also, he drank a lot, which is a typically dwarven thing to do with your time.
for class- well, he did some tracking and wilderness lore stuff... but this isn't worth anything, cuz it's just using his class abilities. However, he roleplayed taking to the tops of the dunes, sticking to shadows, seeking water, etc. and basically used these skills to lead the party through a trackless desert and to safety, so he can get an award for the role-playing aspect of it (just as a fighter could get one for taunting and defeating an old enemy fighter in a duel, even though it was "just fighting").
for alignment- well, in one of the game's fights a companion fell near Dworkin and was bleeding out, but he chose to ignore her plight (he has potions of cure serious) and flee himself instead (and he wasn't in any real danger).
for personal- Dworkin reclaimed a magic sword stolen from him long ago.
Tada! 100 xp/level. This leads to slightly less xp than the standard system, which I think is good. I also give a potential fifth award for props and/or for an especially good idea (this award is very rare- likely once every 5-8 sessions one player gets one), and give a pittance based on the average party level for attending (so as long as you show up you get a few xps).
Whew... a little more than you asked for.
