Microsoft's Exchange team has released Service Pack 2 for Exchange 2010 this morning. The team has not blogged about the release yet (I would expect it shortly this morning) but the link for the download is here. As an FYI, there is a new pre-requisite for the install - IIS 6 WMI Compatibility.
Today Microsoft released version 3 of the Exchange 2010 SP1 Rollup 3. Previously the rollup had been pulled due to compatibility issues with Blackberry. Now, the Exchange team has RU3 for Exchange 2010 back in circulation and can be foundhere.
The full Microsoft product team announcement may be found here for those interested. :)