Don't forget about 3753 Cruithne - Earth's quassi-satellite with a horseshoe orbit discovered 10 October, 1986.
There is a link about this in AA which contains a few images and some information.
Regarding the slow-motion collision of a secondary moon...here's a link:
http://www.space-travel.com/reports/Moons_mountains_made_by_slo-mo_crash_study_999.html
The main thing I find bizarre about Luna is that we have total penumbral eclipses.
I wouldn't prematurely agree with every wacky new idea they come up with. haha
I've just been reading that when our moon was originally formed scientists now thing we had TWO moons! I've yet to find out what happened to the other one!