I'm glad you posted this up Jeff, it really is an amazing feat. I've been getting the email updates for a week or so now, fascinating stuff.
Just to add to the interesting links, here is one straight to the dedicated website:

http://deepseachallenge.com/?source=email_deepseachallenge

And, an interesting video from Rolex, showing off the special watch they built, you really get a sense of how thick the thing is, and how big, look out for when they fit the movement!
(Ignore the 'suits' designing it, that's a bit contrived!)
http://www.youtube.com/watch?feature=player_embedded&v=DZfr2-iGwKI

And some more info on the watch & the history of the event...
http://deepseachallenge.com/the-expedition/rolex-deepsea-history/

Stewart