eMac
1 Ghz PowerPC G4
1 GB SDRAM
160 GB Ultra ATA Hard Drive
SuperDrive with 4X DVD+R burning
built in 17 inch flat CRT monitor
runs OS X (10.3.5, the latest Panther build)
I use it mostly for Photoshopping (coloring and correcting my artwork), web design, writing, and web related stuff (like this!). I don't use it for gaming for obvious reasons. It can emulate old consoles and MAME well enough. I'm not into the PC gaming scene to be honest, so I don't feel too bad, though there are some hot games that are finally worth getting a PC for, like City of Heroes. I know that it might eventually come out for the Mac, but like all other game related stuff, I know it won't match up to its PC counterparts.
Oh, and not to derail the thread, but as loyal Mac user for the past 10 years, I'm more or less sick of them and can't wait to get a PC. Hell I only use Mac for one reason still, and will continue to do so, but I hate the company and the vast majority of its users.