I'm pretty skecpitcal about this body-bomb story. It started off the bomb was in his arse (plausible I guess) but now it appears to have reversed up his digestive tract. The Saudis claim it was in fact hidden in his underwear.
You can be skeptical, but these bombs are available on the open market.

http://www.fakecrap.com/products/fart_bombs.html

http://www.amazon.com/s/?ie=UTF8&key...l_61441ffq9k_b

This is true 4GW stuff, they even have instructions on line so home grown terrorists can produce their bombs. I'm surprised the FBI hasn't pulled these off the web yet.

http://www.youtube.com/watch?v=idfOGItekaw