I've just found this review, so if anyone is thinking of buying a MkIII over a 40D, have a look here I found it very interesting.
http://iwishicouldfly.com/iwishicou...tml/093007.html
Thanks for this link,Cashie.
Reassuring as I've just (yesterday) bought a 40D & today looks like a good day (weather-wise) to get it out of the box!
I read this over at WPF, very interesting read.