Comment Playing World of Warcraft on mine, as I type this (Score 1) 417
Sure, I don't have 4xFSAA enabled, but plays fine for me. Plus:
Adobe Illustrator CS; Adobe InDesign CS; Adobe Photoshop CS; Adobe Reader 8; Autodesk Maya; Delicious Library.app; DivX Converter; Final Cut Pro HD.app; Freefall.app; Google Earth.app; Google SketchUp 6; iDVD.app; iPhoto.app; iTunes.app; Logic Pro.app; MATLAB701; Microsoft Office 2004; NoteBook.app; OmniGraffle.app; OmniOutliner.app; QuickTime Broadcaster.app; Remote Desktop.app; Reunion 9.app; Skype.app; Sound Studio; SoundSoap 2.app; Soundtrack.app; TeamSpeex.app; ToonBoomStudio; Transmit.app; Ventrilo.app; VideoGlide; Virtual PC.app; VLC.app...
Plus many, many, MANY, others. All run without noticeable performance issues. And if I had more than the 2GB of RAM that's in it, it would be even better. As soon as it needs it, I'll spend the money.
If you can see past the "gotta-get-a-newer-machine-because-somebody-out-there-has-something-newer-than-mine" mentality there's no end to the things you can do with an older machine. As soon as my Dual 2.5 ceases to meet my needs It will go into my museum of dead tech with the others. Until then, it will remain my core duty machine.
Hell, not too long ago I won a $100 bet with a friend who didn't think I could get my Radius 81/110 (PowerMac 8100 Clone - circa 1995-1996) on the Internet in less than 30 minutes, from a boxed-up state. It took me 15 and that was only because I had to hunt to find a long-assed ethernet cable to reach from the garage to my office. Easy money.
So if nothing else, win bets off the naysayers until you can afford a new MacPro tower.
Nuff said.