Another thread reminded me of this. I use aerobars on brevets, for a variety of reasons. Besides the opportunity to give my hands/wrists a break, and slightly for their obvious aero advantage, I use the bars to hold my cue sheet. I laminate it, punch holes and use cable tie loops to hang it over the aerobars - flipping pages at controls. It's also great to have to hang things from. Lights, batteries, and spare armwarmers-legwarmers. I'm not the most aero thing rolling down the road like that, but I've got everything I need.