If you haven't seen his site, here's a pretty good overview
In addition to leangains, also check out Lyle McDonald's old forums (monkey island) and also look up Brad Pilon (Eat Stop Eat). There is tons of stuff on IF and fasting.
The Drs. Eades (authors of Protein Power and both MDs, I believe) also have some good blog postings and personal experiments on IF.
PKlopp from MDA had a series of posts giving some pretty cool science behind what's going on in your body.
Intermittent Fasting - A Primer (Part 1) - http://www.marksdailyapple.com/forum/thread27894.html Intermittent Fasting - A Primer (Part 2) - http://www.marksdailyapple.com/forum/thread28459.html Intermittent Fasting - A Primer (Part 3) - http://www.marksdailyapple.com/forum/thread29011.html
This gave me the science I needed to understand that Intermittant Fasting was not only safe but desired.
How exactly? Fasting is fat loss. Excess fat storage is there to allow you to survive a cold winter when food is scarce. If there's no food available and the hormonal environment is right, your body will happily burn bodyfat. Comparatively, caloric restriction but with regular small meals essentially confuses the body. It's not that you won't lose weight that way, but you'll be working against yourself and not enjoying it at all. The links the others have provided will help with some of the science, but it's a very complicated way to go about understanding why not eating burns bodyfat.
This is the one that was recommended on a FB page I follow (Being Primal) just a few days ago.