As for multiple AoO (and possibly many against the same target), you might look into a Robliar's Gambit build.
The feat, Robliar's Gambit, basically allows you, as a free action on your turn, to give everyone, until the start of your next turn, +4 to hit/damage against you BUT makes every attack performed against you grant you an AoO against the attacker. Only difference is they get to finish their current attack prior to you performing your AoO.
Note: this is per attack they perform against you, NOT PER SUCCESSFUL ATTACK!
So, if they fail to hit you even with a +4 to their to hit roll, then they still attempted to attack you, provoking an AoO from you.
If you can combine this with the nigh infinite attacks that a Lightning Mace/Roundabout Kick combo can give you, you might even be able to perform infinite attacks on THEIR turns, heh.