Rick Strahl, formerly a VFP MVP and now a .NET MVP (in C# I think, but with Rick it would just have been a matter of choosing a category) has a great post on why he's not re-writing one of his flagship applications (currently written in VFP) in .NET. Well worth a read. While you're there, have a look at some of the very neat things Rick is doing with both VFP and .NET.

BTW, Rick will be out here in Australia at the end of November to speak at OzFox, along with Ken Levy and a bevy of great speakers.