Most of the general information about radiology residency programs (program director, coordinator, number of residents, TY included, etc) can be found on freida
(
http://www.ama-assn.org/ama/pub/category/2997.html
In terms of the evaluating the educational quality of specific programs, it is probably best to ask students the year ahead of you, residents at your home med school, and your home med school PD.
Besides studentdoctor.net, there is another forum at
www.auntminnie.com that might have the information you're looking for.