* For the conservative types, NUnit is still available and still more than capable.
* For the Microsoft-types, MSTest is adequate, but slow and clunky compared to Nunit. It also lacks code coverage without paying the big bucks for the pricey versions of Visual Studio.
* There’s also MbUnit. It’s like NUnit, but has nifty features like RowTest (run the same test with different parameters) and Rollback (put the database back like you found it after a test)
* And finally, xUnit.net is the trendy option with some attitude.
* Oh, and TestDriven.NET will give you IDE integration for both Nunit and MBunit.