Aaron Adams (yes the switcher) is both a Mac geek and an astronomy buff so it makes perfect sense that he would want to combine the two into an unholy amalgam of telescope and iSight.
Ok, so it is a little more elegant than that. Aaron was nice enough to post directions and example shots that he took using this rig. It looks pretty sweet to me. Now if only I had a telescope and didn't live in the middle of Philadelphia.