Find_Orb is a neat utility bundled with the Guide6 CDRom from Bill Gray's Project Pluto. It can be used to take the positional measurements one has made on an asteroid (or comet, for that matter) and quickly get estimates of the orbital elements which can then be fed back into Guide6 to generate finder charts. It uses input data files in the form used to report measurements to the MPC (which are also generated by the companion measuring program Charon).