Although I haven't used this particular project, I ran across something today that I thought was an interesting project. The project allows you to handle page methods and rewrite URLs. For example if you have a URL like keithelder.net/blog/article.aspx?id=12 and you want it to be keithelder.net/my-title.aspx instead. Virtual URLs are very handy. Even on blogs like this for example where you link to a post of a item, you aren't really hitting a static page. It is all virtual.
The project just released an update for VS2005. You can check it out on the offical PageMethods web site.