OOC Thread
From the rules it looks like they can be spent to do something amazing. There's a laundry list of options in the rules: succeeding at a non-combat task no matter the difficulty, avoiding damage, etc.
You start each session with 6 stunt points. Our GM will have to tell us what constitutes a session here, since there's no benefit to having points left at the end of the session.
Talents are extra bonuses. For example, Monkey Climb gives Andrei a +2 bonus to climb rolls. Grit lets him, once per session, recover HP when reduced to 0 health in a fight. There's a list in the rules, about half of which are +1/+2 to one of your abilities (+1 for the basic talent, if you already have that the advanced talent gets you +2).