>Has anyone developed an intellisense-type data entry feature that displays a popup-list of "candidate" entries to select from as the user types in a name, address, city, state, etc on a VFP form?

I think these guys have something like that: http://www.google.com

Seriously, you can roll your own variation of incremental search. Actually, in your example city and state could be regular incremental search.

One approach for name and address would be to combine incremental search results and substring search; maybe show incremental results near the top and substring results below in a visually separated section.

It's been a while since I coded something like that but ISTR the performance is pretty good on reasonably modern hardware even with substring searches as long as you're working against a local table or cursor.