If you want to quickly test a method, without writing a unit test or creating a separate conosole app fot testing, this is a must have, get it now!!!!
In the BizTalk world if you are testing an external assembly (map or orchestration) make sure your remove your .net assembly that your testing from the gac, once the test passes copy that back to gac again, **one of the limitation of visual studio**, lost good 1/2 hr on trying to figure out why the addin was unable to find my method….
madhukar gilla 