>When using ADO/ODBC to get to a VFP6/SP5 DBC, should I set ADO to run as free-threaded or apartment-threaded? I understand that if you use Access/Jet you should "go apartment", but I am not sure about VFP.

As the ODBC driver is single threaded, go with Apartment threaded.

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>And what would the setting be if I use OLEDB to get at at VFP6 or VFP7 DBC?

Again Apartment threaded.

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>And what would the setting be if I use ADO/ODBC to get at a VFP7 DBC?
The ODBC driver will not be able to open a DBC that has been configured to use the new DBC events in VFP 7 so you shouldn't use this at all, IMO.