The update, which is free for all Parallels Desktop users, includes several important upgrades, including:
- Video output improvement and acceleration
- Added multi interfaces USB devices support (including Windows Mobile 2005 devices)
- Added isochronous USB devices support (including WebCam devices)
- Minor USB fixes
- Keyboard support improvement: Eject CD key support, left/right Shift/Ctrl/Alt (Option)/Windows keys difference support
- Added virtual disk cache policy option: Mac OS X performance optimized or guest OS performance optimized
- Image Tool fixes
- Optimized disk cache policy for Suspend/Resume feature
- Windows ME Suspend/Resume fix
- Shared Folders first time access acceleration
- Clipboard synchronization tool fixes (unreadable symbols sometimes added during copy and paste)
- Sound playback improvement
- Sound recording improvement
- Minor Full Screen mode fixes
- “Unable to allocate virtual memory” during virtual machine power on fix
- Minor GUI fixes and improvements
- Solaris doesn’t work with more than one virtual disk fix
More info
here.