Well looking at the bicycle speed and power calculator (
http://www.kreuzotter.de/english/espeed.htm ) a 1/2 lb loss in weight for me on a long climb would mean about a minute difference in my climbing speed (I've used a 24.5 mile, 4,300 foot race that I do in September as my example since that's where weight is likely to play the biggest role for me - on a flat course I doubt this would make a difference...) hmmmm maybe I should try to find a lighter stem - and cut my hair
(yup on the flats it would take about 12 extra pounds to make a 1 minute difference in my speed over 24.5 miles)