I had some exposure to the C64 as a kid, but since my first computer was an Amiga, I never really got around to exploring the C64 library. I played some Frogger, Ninja Mission, Crazy Taxi, and Montezuma's Revenge way back when, but that's about it.
I prefer to play classic computer games on the original hardware, so I haven't tried emulating any C64 games. Maybe one of these days when I have enough space, I'll pick one up, along with one of the modern mass storage accessories.