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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If you're trying to compare video cards, try this comparison page. In the graphics card letters game avoid cards labelled LE (nVidia, ATI/AMD) or XT (nVidia only) as they are slower than the vanilla unlettered cards.