Exchange 2007 SP1 Beta 2 was offically released to the public today.
http://www.microsoft.com/presspass/press/2007/aug07/08-13Exchange2007NewPR.mspx

http://msdn2.microsoft.com/en-US/library/bb608442.aspx

Features that are new to Beta 2:

-The Long awaited SCR
-2 new themes (X-Box, Zune)
-Supporting digital signatures with certificate that do not have email addresses in them for S/MIME

S/MIME features which were not complete in Beta 1:
HTML filtering (now S/MIME message reading and editing is full fidelity)
OWA Printing
Admin settings
Integration with anti-junk/phishing mail features

New EMC features for Beta 2:
Full Access permission management for mailboxes and mail-enabled public folders
Preview of Address List/Email Adress Policy/Distrobution List with custom filter
Numerous ActiveSync policy settings have been added i.e ability to disable camera or wify

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So far I have done a number of upgrade which have been successful however have found a few issues:

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