In two or three years time when we start seeing XNA titles in the shop (best case scenario).
That's really only because of the infancy of XNA. Once it stabilizes, it won't take long after that. Especially if the software is developed with the change in mind.
Yeah. Resharper and csUnit are my personal favorites. Too bad they (like almost everything else useful) don't work on Express Editions.
The more I learn about the express edition, the more thankful I am that I have a different version.
It won't be long before XNA works with the pro and standard editions. Seems ridiculous that they would target a professional market and then make the tools incompatible with the professional development suites.
nUnit is a good tool too. And I believe it's open source.