According to the SRD, you only get to make a single melee attack as an attack of opportunity. So no trip/grapple/etc. Touch spells wouldn't be able to be CAST as an AoO, because they're still a standard action, but they could be delivered if the charge is already stored. If a maneuver has an action of one attack action (so you can use it as part of a full attack), then yes, you could use it.