The following hotfix for Revit Server just came out and I thought I'd give it a little extra publicity. :) From the hotfix page itself:
"This hotfix addresses a crash that may occur when Revit is uploading data to Revit Server during a Synchronize with Central operation. It must be applied to both Revit Server and Revit product to be effective.
Make sure that Update Release 2 has been applied prior to adding the hotfix to the Revit product. Verify that the build number of Revit 2012 is 20110916_2132."
If you've been running into any issues with Revit Server stability - give it a go!