You could always use IIS, and turn it on and off if it's just to test stuff. Of course, if you don't like that (which it seem you don't :p ), I always recommend abyss X1 server. It's free too, and has asp.net support (don't know version support though, doesn't say). You can find it at
http://www.aprelium.com . It does have asp.net support, whether it's 2.0, like I said, I don't know.