When I was riding competitively a few years ago, my favorite was Gu - Vanilla Bean flavor. It kinda reminds me a little of vanilla frosting. Often when I'm riding hard, there are many foods/flavors that I can't stomach, but the Gu went down really easy. I did manage to splurt most of a package over my hands during one ride (can you say "sticky"!!) but then I got accustomed to opening them on the fly and managed to get it all in my mouth thereafter. :-)

Sports drinks - I confess I've never been big on these. Mostly, I just use water. But I find most of the drinks way too sweet/strong and if I do use them, I water them down quite a bit. My favorite was Shaklee's product, which you have to buy through a rep. The worst I've ever had is All Sport. Totally vile!