I've used virtual machines with SQL Server at my last 2 jobs and its worked fairly well. The only thing I can think of off the top of my head is that if they are going to make any changes to the virtual environment .. particularly disk space .. shut down your SQL Server while they do it.
We increased disk space without shutting down SQL and completly corrupted our databases.
The only other problem I've seen was a snapshot that got out of hand. It kept updating itself and using up more and more space. Even though we had told it it was a one time snapshot. We found out about it when it eventually used up a terabyte drive. Not entirly sure what caused it though because our server team handled it.
Kenneth
Kenneth FisherI was once offered a wizards hat but it got in the way of my dunce cap.--------------------------------------------------------------------------------For better, quicker answers on T-SQL questions, click on the following... http://www.sqlservercentral.com/articles/Best+Practices/61537/[/url]For better answers on performance questions, click on the following... http://www.sqlservercentral.com/articles/SQLServerCentral/66909/[/url]Link to my Blog Post --> www.SQLStudies.com[/url]