You could try the trial version of Elcomsoft's IM password recovery software. If it doesn't do the trick I'm sure there's other similar software, but watch what you run as lots of software in this category tend to be shady. You can also try just waiting, the password often pops into your head after a while.
i can't remember my answer to my question of "nothing"
That Advanced Instant Messengers Password Recovery program is a cool little utility. I tried using it to get one o fmy old icq passwords back, BUT it only works on passwords 3 characters or shorter. Anyone else got a reliable one that is perhaps freeware?