I was wondering about the same thing! I have an annual review shortly and I have been doing things over and above my job description. In addition I am travelling a good bit, which is costing me. (I know one is not supposed to make money on travel claims, but I am out of pocket as I have increased childcare when I travel.) I don't know whether to ask for more money as it stands, or offer to do even more work (which I dont really have time for, without getting help from more junior colleagues).
Now that I think about it, I might as well ask as the worst that can happen is they say no, in which case I am no worse off! Gutinstinct, my "Gut Instinct" is to highlight all the good work and then ask away. Good luck, and let me know how you get on!