I've been using WinMX for a while now. It's been working pretty well. I had a few problems with it, but when I change isp, they went away (things like loosing connection to the network, ect.).
I've downloaded all kinds of stuff there, vidoes, music, audio books, you can find pretty much anything there. Not much tickling stuff though.
And unlike Kazaa (which is next on the RIAA's and MPA's list), there is no central server for them to shut down.