tbh, not that much. Let's see... tinkering with the OS, programming (usually with StormC these days), email (YAM), playing the occasional game, writing the occasional letter (Wordworth). Some of the stuff I can do with my Amiga, I use the PC for - unfortunately my Amiga is a tad unreliable and underspecced to play mp3s or videos at decent quality, and web browsing is just frustrating. I'm hoping an AmigaOne with OS4 will solve my problems, providing I can do web browsing effectively and get images off my digital camera (the two things I use this PC for), I can ditch the PC.
Oh, and I've been playing GTA on the PC recently as well (it's available for free download), so I might have to take advantage of that Payback offer as well.
Chris