Just FYI: Here are the release notes contained in the 5540 Build.

What's New in Parallels Desktop 3.0 for Mac Beta (Build 5540)
• Mac OS X Leopard support
o Mount virtual disks to Mac desktop
• Virtualization Engine
o SMBios support
o Significant Windows Vista and Windows XP performance improvement
• Network
o Port forwarding support for Shared Networking implemented
• User interface
o Support for "~" in paths (to HDD, Shared Folders and such) implemented
• Virtual devices
o Possibility to use two identical CD/DVD drives in VM implemented
• Video and 3D
o DirectX and OpenGL performance improved
• Parallels Transporter
o Migrate Windows from your Boot Camp partition to a Parallels virtual disk image

Bugfixes and improvements in Parallels Desktop 3.0 for Mac Beta (Build 5540)
• Primary OS support
o Wrong disk permissions after installing Parallels Desktop - fixed
o Applications icons are not shown in Dock on Leopard - fixed
• Stability and resources usage
o Sound related segmentation faults: troubles when playing in PokerStars, browsing the Web - fixed
o Segmentation fault when deleting Snapshot in inactive state of Guest OS - fixed
o Windows Experience Index is not counted properly in Vista - fixed
• Coherence
o Windows Taskbar behavior in various view modes - corrected
o Command key doesn't call Windows Start Menu if Windows Taskbar is hidden - fixed
o Visual Studio 2005 taskbar jumps over the screen when moving it - fixed
o Cursor jumping about in AutoCAD - fixed
o Visual Studio hangs when moving toolbox panel - fixed
o Visual Studio debugger hits breakpoint when running in Coherence - fixed
o Black rectangle instead of Start button in Vista - fixed
• Parallels Tools
o Error 5009 appears during Parallels Tools installation - fixed
o MIDIoverLAN CP 3.2 doesn't work with Bridged networking - fixed
o Parallels Tools installation on SuSE 9.3 guest fails - fixed
o Wealth In Motion failed to register throught the network - fixed
o Wrong key codes conversion - fixed
o Japanese Input Method (MSIME) doesn't display convert candidates on a pop-up window correctly - fixed
• Disks and folders sharing
o Some 3rd party applications can not be installed/uninstalled with Shared Profile enabled - fixed
• Virtual devices
o CD/DVD drive detection for some Linux distributives is broken - fixed
• Video and 3D
o Video memory size inside VM and in VM settinigs are not always similar - fixed
o CatiaV5R16: Error on startup - fixed
o 3DMark 2001 benchmark mode causes segmentation fault - fixed
o No textures in some games on nVidia graphic cards - fixed
o DirectX and OpenGL performance - improved
o Lots of application compatibility fixes
• Parallels Image Tool
o Disk package permissions corruption during split operation - fixed