Damn, I've never had a C64, nor have I ever used one (well, maybe at a friends house when I was very little, but not for as far as I can remember), but seeing all this nifty little C64 hardware stuff really makes me think about buying one!
Especially those sample mp3s on the Prophet64 site make me really want to have one. Saves me buying a real 303 which I will probably only use for 15% of it's possibilities :-)