The built in webserver from Visual Studio 2005 is great for locally quickviewing asp.net websites.
I always thought it was a pitty that I had to start visual studio for it.
Today I came accross a blog of a guy who wrote a small shell extension so you can right-click any folder and choose run asp.net 2.0 website from the context menu. It will run the webserver on that folder. How easy do you want it ?
Read more about it here :
http://weblogs.asp.net/rmclaws/archive/2005/10/25/428422.aspx
http://weblogs.asp.net/rmclaws/archive/2005/10/26/428600.aspx
Download here :
http://www.interscapeusa.com/downloads/download.aspx?file=WebServerHere_v1.msi