On msnfanatic alone there are several programs posted that can/could do that, and if you search all the msn related sites you'll find many many more.... I tried several of them, some dodgier then others, some crappier GUI's then others.... Noroom's listcleaner is the only one that works the most user-friendly though...
EDIT: you wont find "hundreds", but you'll find many, it wasn't meant literaly