I found this article that talks about some of the classes used in the .net framework v2.0 when doing XSLT.

http://www.15seconds.com/issue/060608.htm

I am taking a course on XML / XSLT at UofC that I am planning on doing in .Net.  I have written xml schamas xml stylesheets and xml transforms before, but not using .net 2.0, so it should be interesting.