Parallels releases a free update for Workstation 2.1.  The good news, no new key is needed.  So go download the update from the Parallels Web site and start benefiting from these fixes:

• Fedora Core 5 Linux installation problems
• Incorrect initialization of VT-x mode
• Minor Windows and Linux primary OS bugs
• Inoperable keyboard in RealVNC remote session
• Activation from non-root user account
• USB scanner operation
• The segmentation fault that sometimes occurs when working with USB
• The exception fault that occurs when compacting virtual disk image

Thanks to Ben and his blog site for the information.  If you haven't checked it out, do so.  And if you haven't already tried Parallels Workstation, go download it and give it a try.  They offer a free 15 day evaluation.