Jason Khalipa (5th overall) from CrossFit Santa Clara came off of a really bad run in which he collapsed and finished 72nd out of 74 athletes, and was able to work his way back into 5th place over the next 2 days.
There was also a CrossFit Journal article about his experience.
Jason writes about his training for the Games:
My training consisted of CrossFit.com workouts once a day up until about 4 months prior to the CrossFit Games 2010. At about 4 months out Austin (CrossFit Unlimited) put together a training program that I used up until the Games. The program consisted primarily of CrossFit type workouts in conjunction with heavy Olympic lifting and hill runs. I trained 6 days a week but made sure to listen to my body if I needed a rest day.
Typically I trained twice a day, however the last few weeks before the Games I stepped it up to 3 times and sometimes even 4 times a day. However each of these workouts were different, some focused on strength while others worked on my recovery time or endurance.
Contrary to what many people may think, and I don't blame them either, I did in fact train hill runs twice a week every week for 12 weeks leading up to the Games. The hill runs ranged from short and intense interval training to long distance 5-7 mile runs. In the weeks leading up to the Games my training was:
5 weeks out, 4 times a day
4 weeks out, 3 times a day
3 weeks out, 2 times a day
2 weeks out, 1 time a day
1 week out, active rest
And I always try to practice what I suck at.
My nutrition was mediocre at best, I did not follow a strict Zone or Paleo diet. I watched what I ate and tried to make smart decisions but did not focus on my diet nearly as much as I did my training.