Starfox
Hero
I'm thinking of putting up a standard minor quest: complete 2 milestones, get some XP. I might also put up some sort of milestone bonus powers the group can choose from - +1 attack, +2 damage, that sort of thing.
I find XP rewards work strangely on my players, and are not always encouraging. If you play 4.0, there are 30 levels. Once you've passed those 30 levels, the life of the character is effectively over. Well, some players want to keep playing their characters, and thus don't really want XP to come to quick.
Of course, XP are also "You Win" points and a universal reward to make players feel appreciated, aside from their effect on character advancement. That way, they work excellently as rewards.
Just musing. Don't take me too seriously.