The new beta build, an 88.1 megabyte download (courtesy of VersionTracker), features the following fixes and changes:

-Primary OS support - Leopard compatibility improvement
-Virtual devices - USB devices compatibility improvement (including Blackberry)
-Bug fixes and improvements in Parallels Desktop 3.0 for Mac Beta (Build 5570)

Primary OS support:
-Parallels Desktop installer hangs on Leopard - fixed
-Can't install Parallels Desktop on Leopard when Internet Sharing is enabled - fixed

Stability and resources usage:
-Parallels Desktop hangs with spinning ball when trying to start VM after changing virtual memory amount - fixed
-Several kernel panics during VM startup - fixed
-Guest Vista goes to BSOD being idle - fixed
-DOS16M (16 bit DOS extender application) crashes Parallels Desktop - fixed
-Guest Vista fails to sleep and goes to BSOD - fixed
-Fatal error when executing some command line utilities in Windows - fixed

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