Easy Adder - A winsock based myspace bot. It is very fast and it seems it owns around 1 thousand users. They mainly sell this bot, and they also maintain some other softwares like RRD Editor. URL: http://www.1shoppingcart.com/app/?Clk=2435483
Friend Blaster Pro Myspace Bot - It seems this is the most popular myspace bot which can add friends, send messages, post comments, ... for you automatically. Their model is simple: they sell it. And if you are interested in affiliate, they will give you 12$ for each sold copy.
URL: http://www.addnewfriends.com/affiliate/idevaffiliate.php?id=2224_0_1_12