You Mac users probably know about this already, but in case you didn't, go here: http://www.macheist.com/ There's a bunch of software that they normally charge for, only it's freeeeeee for the next few days. No idea what's there - I'm not a Mac guy - but hey, maybe you are. Enjoy!
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It's a good price - you can't find them on eBay for less than $500, I reckon. I'm assuming it's got Leopard (10.5) on it? I can't remember if 10.6 is going to be Intel-only or not (EDIT: yes (tuaw.com))