Um, I think I agree with what everyone else already said...I'd vote for equal XP to all party members, and if ya wanted to pass out "bonus" XP for particularly flavorful RP ... well.. I'll be posting more often then.
In my TT games, I don't even bother with XP... levels are handed out after the completion of "quests" or "chapters," depending on what they've been doing, and I use a system similar to that found in the Artificer's Handbook for item creation. XP is just a crutch for weaker minds!
Unless you use XP, ya know.. then its perfectly cool...