I've placed a few links to radiology tutorials and teaching materials, as well as to a handful of training programs, on this page. Feel free to explore. I will keep adding more as time passes....
Problem or case-based tutorials of radiology:
BrighamRad: Radiologic cases with discussion. Over 150 cases on file with clinical history, radiologic findings, and a short discussion, searchable by imaging modality or organ system.
Basics of MRI. An online textbook explaining the physical basis of MRI.
Intro to MRI. A watered-down coverage of magnetic resonance imaging physics, but approachable for medical students who want a quick glimpse into the subject.