I started out with the jelly belly jelly beans but have been using Twizzler bites for a while now. Quick carbs and easy to use out of an open ziplock baggie stuffed in my jersey pocket.
I see them at every trade show, and love that stuff. They have a coffee one that is awesome too.I was at a nearby REI recently and I picked up an energy bar called a bonk breaker. The one that I had was peanut butter and jelly and I have to say that it was pretty tasty.