Not the one you asked, but since I own some...
Vibram has a sizing conversion on their website.
http://vibramfivefingers.com/
It works for MOST people...but the store I ordered from said sizing returns on the 5-fingers were about ~20-25%...usual return rates are 2%. Finding a store and trying them on would be your best bet, if possible. Some REIs stock them. Vibram has a store locator, too.
I usually wear a 10-10.5 in running shoes, but wear a 41 Sprint.
I ordered 42 Classics, but they were too big. Tightening the shock cord made them more secure, at the cost of pain from the cord cutting into my skin.
The 41 are about right - maybe a little on the small side in a toe or two. The 5-Fingers tend to be looser in the heels than the toes. I personally prefer the Sprints over the Classics...the strap secures them quite nicely, and I find them to be more comfortable. I did not like the elastic on the Classics.
Injinji socks are good if you want socks with 'em.