>I'll let others talk about web development in ASP.NET vs VFP.

Well, I think nowadays we must think much as ASP.NET + VFP, than ASP.NET vs VFP. :)
that´s because we can use everything we already know from VFP (data manipulation, string manipulation, and so on), and all the power of ASP.NET, along with the extremely produtivity obtained with the VS.NET´s IDE.