I don't have any really good ideas but I know there is a book out there with great ideas on how to get even with a cheating scum bag spouse, (and they are very careful to ensure you don't end up charged or in jail). I wish I could remember it's name but I bought it for a friend and had a sneak read before I gave it to her and I can remember sitting there with tears of laughter rolling down my face. Try searching on Amazon.
Seriously though, anger is a stage you do have to go through - just don't let it destroy you. In your situation I think the best way of getting your own back is to show your H you are just fine and dandy without him and there are plenty more pebbles on the beach.
As I have said to so many others on here before, whatever you do, remember that revenge is a dish best served cold and on a long wooden stick.
You go girl - sorry I can't be more useful.
Saffie me 46 H 46 M in 1986 D20,D18,S16,D13 H's A 01/05 to 07/06 H recommitted to M 07/06 renewed vows 09/06 Going from strength to strength