Wine-Doors - A must have for wine users.

Wine-Doors is a great free alternative to applications such as Cedega or Crossover. It makes it really easy to install and config windows native programs by doing all of the dirty work that would usually take hours.
The interface is similar to Ubuntu's Add/Remove Applications program, and it does everything for you. All you need to do is just click next a few times and accept the occasional license agreement. :P

The only downside about wine doors is the amount of supported apps. Since their not some big dev team there progress is slow. But you can't beat free.

Wine-Doors Site