>Other than SP3 - what other (if any) patches, etc. are available and should I run as I prepare to upgrade from 5.0a to 6? After installing all I should, what version (the long num) should I have?

As far as I know, SP3 is all you need. You can check for other downloads at:
http://msdn.microsoft.com/vfoxpro/downloads/updates.asp

Version number after applying SP3 is 06.00.8492.00. The product will also say SP3 at the top of the Help About screen.