I have just attended an excellent free webinar session on ASP.NET testing with Ivonna and Typemock by Gil Zilberfeld of Typemock and Artem Smirnov creator of Ivonna a Typemock add-on for unit testing ASP.NET

The session is being repeated today at 2pm GMT and I understand a recording will appear on the Typemock site in due course.

So if you get a chance this afternoon have look, it is well worth your time if you work in the ASP.NET space. Personally I have also found Ivonna useful for Sharepoint testing too, watch the session it might give you some ideas.