An updated VSTO 2005 SE runtime (VSTOR.exe, build .891) is now publicly available for download at:

http://www.microsoft.com/downloads/details.aspx?FamilyId=4468D8CB-B43E-4B09-82F6-8BA3F7B5E935

This update contains a couple of bug fixes in the area of Outlook automation. It also contains a number of updates to support Visual Studio 2008. The Customer Support team is working on a KB describing more details of this update. More on that soon.