Don't forget WINE.

OSX is a *nix os and it can still use wine. WINE if it gets a bit more work is/will be a godsend to the *nix community.

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system: Intel Core 2 Duo e6400 @ 3.6GHz; 4*1GB RAM(micron D9GCT) @ 450mhz(DDR2-900) 4-4-3-8; Enermax Liberty 400AWT PSU; nvidia GeForce 8800GTS 640mb (660mhz core; 2120mhz mem)