I have a few old apps using Sql 2005/Vis Studio 2005 and dont want to upgrade them out there in the field yet. Ideally i'd like to have all 4 on my development machine. Tried recompiling an app (using Sql Server CE) (not SF) but got some errors.
I first deployed to VM's to get confortable, but eventually did a 2008 to our development server that also houses a 2005 Standard, and a SQL Express for good measure. Fine for development in my opinion.