Cut through the crap, when it comes to Mac OS X apps! I've spent time talking to friends, and testing out applications. These are my favorites. I don't post everything; on the contrary, I put up only the best of breed. You won't find any junk here, other than maybe my design.
Suggest a KILLER app.

Virtualization

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Parallels
Although a commercial product, this application is a must if you intend to run Linux or Windows on your Mac. The quality of this product far exceeds any free solution ever released.