I came across this cool example of using WF to drive ASP.NET page flow.

http://blogs.msdn.com/mwinkle/archive/2007/06/07/introducing-the-pageflow-sample.aspx

We used to have a framework similar in concept to this back when I was at Avanade (part of ACA.NET) that used a State Machine to control page flow.  If you're building complex ASP.NET applications, this kind of technique can really help you manage navigation experience through a complex process.  State Machine worked pretty well for us, and I bet this one will too.  Enjoy :)