I just came across NUnitAsp while trying to find some way to unit test ASPX pages. It seems to be a fairly comprehensive extension for NUnit and would fit right in.

The only problem I've got so far is that it doesn't understand buttons that use Javascript in the submit instead of having a href reference. This is fairly critical to my testing and basically means I can't use it.

If anyone else knows of a good way to unit test ASP.NET please drop me a line.