I just replaced the 1" threaded fork on one of my road bikes with a 1" threadless setup, featuring nashbar carbon fork (only $99!).
It has several advantages:
1) Lightens up the front end
2) Stiffens up the front end
3) Makes the cockpit components more comparable with my other bike, which is 1.125" threadless.
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"Your beauty is an aeroplane;
so high, my heart cannot bear the strain." -A.C. Jobim, Triste