I found some information about a triathlete who is gluten free on the celiac.com forum under the sports section. There was an article about Desiree Ficker in the October 2007 issue of Runners World magazine.
The magazine gives a sample of her diet.
Pre-workout breakfast: 2 pieces rice bread with butter or honey, banana, coffee
Post-workout breakfast: berry smoothie with soy milk
Lunch: chicken breast on spinach, tortilla chips
Snack: banana or grapefruit
Dinner: brown rice, fish or chicken, broccoli, carrots, zucchini
Dessert: vanilla soy ice cream
You can read more about Desiree at her website. She gives tips about gluten free nutrition during races and other information. It’s always good to see someone excelling physically on a gluten free diet. She even offers to answer questions about nutrition. Here is a blog from IronBri who discovered Desiree through his girlfriend who was having problems with gluten free nutrition with her training.
Check it out! 
