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This might be good for you Mac / Linux gamers.
For today only (October 31st), you can get a copy of CrossOver for free.
From wikipedia.
CrossOver (a.k.a. CrossOver Office before version 6.0) is the collective name for two commercial and proprietary programs developed by CodeWeavers that allow many Windows-based applications to run on Linux and Mac OS X using a compatibility layer. The programs include CrossOver Mac and CrossOver Linux.
The programs are modified, proprietary versions of the public Wine source tree with various compatibility patches added, more user-friendly configuration tools, and commercial support. CodeWeavers employs several Wine developers and contributes code back to the free software/open-source software Wine project as per the GNU LGPL, although CrossOver is proprietary software.
thanks :)