The great news is arrived: finally, also who works every day on building big data-driven applications will have a great Visual Studio 2005 edition totally for these tasks: Visual Studio Team Edition for Database Professionals.
This tool will make possible to entirely control the Data Development Lifecycle , using Database Refactoring and integrate Unit Testing into your DB (plus more 
).
We'll see something more on the next months, but for the moment this is an exciting news... 