Alright, since I did a quick skim over the article liked by @JonChesterfield and didn't find any discussion of how they calibrated their fMRI machine or if they did any Multiple Comparison Corrections, time to post the obvious:
http://prefrontal.org/files/posters/Bennett-Salmon-2009.pdf
fMRI is not a silver bullet, do your due diligence everyone. I'll wait for this to be replicated before I read anything into it.