> what can you do in VFP that you cannot do in .NET today?

I don't think there is an equivalent to the builder technology that VFP has. A particularly tedious situation is to create a datagrid and populate the appropriate properties there, at least in the demonstrations/articles I've been exposed to.

I haven't seen the ability to create a "quick report" like I can do in VFP.

These are off the top of my head. Those with more experience with both perhaps should be able to come up with more.

I think many people have stated that you cannot be near as productive with .Net as you can be with VFP. If you can, the books and papers that cover VFP to .Net conversion do not address this (ie, how to be as productive), which is pretty key to sealing the deal for many.