I'm not a tri person either, but a bunch of centuries.

Fig newtons are great,and hold up well to abuse in a pocket or bag.

Some of the gels aren't really as gel-like as others - the Power Bar chocolate is more like chocolate frosting. I second the Stingers too - or just get some honey packets from a restaurant.

I have tried the Clif-shot blocks. Interesting texture. Not as solid as a gummy bear, and not as squishy as a gel. Try them before you buy a whole case. I didn't mind it, but my boyfriend hated them.

You don't have this luxury in an IM, but I need to get some real food and get off the bike for a minute at around 60-70 miles. I always seem to hit a little wall, where I just hate my bike. Hate it, hate it, hate it. I take a break, get some real food (here come the fig newtons) and then I'm fine and back in love with the bike.