For my latest work, i've made a model of the giotto space probe, and included an xyz file of it's 1999 Earth flyby. (Horizons doesn't have it's encounter with Halley's comet unfortunately...)
Here are some screenshots:
The zip with the xyz file also contains 2 ssc files for Giotto, showing how its orbit was modified by the encounter with the Earth.
As always, the site is http://homepage.eircom.net/~jackhiggins/celestia/