Bearshare is good but sometimes you get trojans the ones that are very hard to remove. I install when I really need to then run scanes for virus and then i unisntall it when done.
I use limewire. Limewire doesn't give me crap. It doesn't give me spyware that takes up system resources. However, the program itself does take up some resources but doesn't spam my display screen with junk such as viewmanager, damn i hate that thing. Last thing i downloaded was Black Bible.