Check out this great resource for radiology education: http://www.radiologyeducation.com/
It's a great set of links which are categorised by subject. For those sitting the first part later this year, check out the online atlases. Very handy.
Radiology: April 2008 Archives
Another one for those looking at sitting the first part radiology exam soon:
http://radiographics.rsnajnls.org/
It's a free online journal with great articles for those learning basic radiology physics. For a great list of articles do a keyword search with 'physics' in the search field.
Enjoy.
