CodeWeavers (the creators of CrossOver) had a special deal on October 28th, 2008. They gave away their software (CrossOver) to anyone who registered on their special webpage (no longer accessible).
I did my part in registering, and today I received the final instructions for registration code for CrossOver.
CrossOver is a piece of software which enables you to run Windows programs on OSX without the use of Windows itself. The list with compatible applications grows every month