>Could someone please tell me of some good places for advanced training courses in VFP6.

Good may be subjective. Here is a list to start with. Others may have some specific experience with the companies.

http://msdn.microsoft.com/training/resources/vfoxpro.asp
http://www.advisoracademy.com/
http://www.microendeavors.com/tours/vfpsem98.htm
http://www.advisor.com/fw9810c.nsf/wpages/main
http://www.appdev.com/vfp/default.asp?NewPage=/vfp/home.htm
http://www.micromegasystems.com/html/training.html
http://www.takenote.com/
http://www.leadassoc.com/
http://www.isresearch.com/

Another option that people talk about is attend a conference. Here are some coming up.

http://www.advisor.com/cmf0009p.nsf
http://www.eps-software.com/DoubleImpact/
http://www.mesllc.com/conf99.html