Get your free version of version of CrossOver Pro (including CrossOver Games):
http://lameduck.codeweavers.com/free/
Something to do with the price of gas in Minneapolis...
CrossOver Games is great for playing TF2 on your Mac, for example :-D
Edit: The servers are pretty busy with respect to downloading the actual software, rather than just getting a serial. But the download deadline has been extended by 48 hours.