Favorite P2P Program?

sorry to all if this topic has allready been disussed but i searched and i didnt exactly find what i wanted.. ok so here goes

I recently deleted kazaa, thank god, it was killin my old computer, but anyways, i was wondering what everyones favorite p2p program is. I would make a poll but i dont now very many of them.

so if anyone has any suggestions? ive heard livewire is good and so is overnet. o and if anyone knows of one that doesnt have a lot of spyware/adware and or bog down your system thatd be great.