Magicians And Mathematicians http://www.wilmott.com/blogs/paul/index.cfm/2008/12/12/Magicians-And-Mathematicians Imo, this is probably the single most important insight that keeps most quants from also becoming traders. Taleb has been saying something like this for a while, but he is not as insightful as the presentation of this article. BTW, I understand the difference between frequentists and bayesian statistics, so don't make that objection to me.
this is why the wall street firms stick the vast majority of these people in the back office while the "dumb" MBAs work in the front office.