My favorite fox sites are maintained by regular participants here on UT such as Jim Booth, David Frankenbach, and Steven Black. There's a link to Steve's on his advertisement on the main page, and Jim & David both carry a link to their sites in their signatures.
As far as group participation sites like UT, this is the cream of the crop IMHO - no sense looking else where =D)
Roxanne M. Seibert
Independent Consultant, VFP MCP
Code Monkey Like Fritos