Parallels Desktop 3.0 for Mac Benefits:

You can run OS X, Windows, and Linux at the same time.
It's Easy to Install - No drivers needed.
Run your PC games - It supports OpenGL and DirectX.
It's Fast and Stable - You can close your virtual desktop and resume quickly.

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Run all your Windows applications

If you just switched to Mac, there may be a lot of Windows-only applications or PC games that you need for your Mac. Parallels let you run all those programs virtually!

Play your PC-only games including 3-D games!

Now, you can play your 3-D games and graphics applications on Mac. It supports OpenGL and DirectX.

Support Other Operating Systems like Linux or BSD

Beside just Windows, you can run OS X, Windows, Linux or BSD at the same time and no need to reboot to switch!

Use your mobile phone, PDA, digital cameras like before

You can just use your Windows-only gadgets or devices the same way like you used in your PC. Just plug & play!

Final says about Parallels Desktop for Mac:

"I think Parallels Desktop 3.0 for Mac is the most impressive version released so far. It makes your PC to Mac transitional life much easier. Also, you simply don't need to check other virtual PC software out in the market because they are nowhere close to Parallels."