FYI...for those doing IMWI 2012 it might be worth noting that Bonk Breakers will be handed out on the course this year on the bike and run aid stations:
Peanut Butter & Jelly
Peanut Butter Chocolate Chip
Fleet Feet Sports Madison carries all these flavors and I prefer the Peanut Butter Choc Chip. I've used them for approximately a year and find they pack a great punch @ approx. 220 calories each. Feels like eating a decent solid food.
Taylor Key -IM Athlete