>What's a good source for learning about upsizing an existing VFP app to use a SQL database (books, websites, etc.)?

There is a book at www.hentzenwerke.com, Client/Server Applications with Visual FoxPro and SQL Server, that is very good. Also, there will probably be a number of sessions on SQL Server at the Great Lakes Great Database Workshop (GLGDW), hosted by Hentzenwerke.