Well , To get Someones Ip through aim , my answer would be to fire up netcat and let it bind with a port that isnt listening.Ok , if you don't have netcat you can get it from here http://www.atstake.com/research/tool...ork_utilities/ Then After you tell netcat to listen on port whatever , a status screen will stay and wait for incoming connections.
Then construct a hyperlink as follows telnet://yourip:listening port then when the idiot clicks on it , you will have their ip.May seem like a long process , but it gets easier as you use it.
Note:Make sure the person is really dumb, or they could decide that revenge is sweet seeing as though they have your ip.