From Parallels, Inc.:

Parallels Desktop for Mac is the first solution for Intel-Macs that give you the flexibility of running Windows or Linux on a Mac simultaneously without rebooting. The upgraded 3.0 version delivers completely seamless user experience, native hardware experience and protection against mishaps. Now you can enjoy great new features that make your life much easier: cross OS application & file integration with Parallels SmartSelect, offline access to virtual machine files with Parallels Explorer, improved Coherence 2.0, including shared folders and UI enhancements and Linux Tools for seamless integration between Mac OS X and Linux. Also, now available - 3D Graphics Support! Now you can play your favorite Windows-only games and run the most popular graphic applications on your Mac and enjoy the best of both worlds at the same time. Evaluate the expanded support for USB 2.0 devices, developed USB 2.0 connection assistant, which quickly connects you to the OS of your choice. Hardware experience becomes easier with shared printers for cross OS printing and significantly enhancements performance and audio quality. Protect your data from mishaps. Hit a problem? Quickly and easily go back in time to a clean VM state, bulletproof your VMs with SnapShots, control the levels of integration and isolation with Security Manager and make your virtual machine read-only.