I stumbled upon this site by accident. I havent went through it yet, but the last two sections are certainly worthy of having a look through:
errors in FA 2007
errors in HY cell and mol.bio.
http://rumorsweretrue.wordpress.com/usmle-step-1/
errors in FA 2007
errors in HY cell and mol.bio.
http://rumorsweretrue.wordpress.com/usmle-step-1/