Just found a couple great sites for finding free access to
medical journals.

http://www.freemedicaljournals.com/ (note, some of these are
free trials)
http://www.coreynahman.com/medical_information.html

The www.coreynahman.com also has lots of links to other medical
stuff, like drug databases. Such as links to new drugs from the
FDA. Here's one about cancer:
http://www.coreynahman.com/cancer.html