Comets
Links
Tim Harincar - notebook of a comet hunter
http://www.skyrover.net/notebook/
Logs and notes of an amateur astronomer's search for undiscovered comets.
Small-Body Orbital Elements
http://ssd.jpl.nasa.gov/sb_elem.html
from JPL/NASA. Provides access to orbital elements for the numbered asteroids, unnumbered asteroids, and comets contained in JPL's DASTCOM database.