The best thing I learned at PASS 2008 was in regards to the SQL Server Upgrade Assistant. I wasn't alone in the people that didn't know this tool existed. When the presenter asked for the hands of those who had used or knew of the tool, not many were raised. I knew of and had used the SQL Server Upgrade Advisor before, but this tool was the real deal and helped us get approval sign offs in record times. This tool saved my organization SAIC a great deal of time an effort in staging and testing for our upgrades from SQL Server 2000 to SQL Server 2005. We plan to make use of the tool again when we go from SQL Server 2005 to SQL Server 2008 sometime in the future.