Bit late this week, but nonetheless...
Astronomers think there may be more free floating planets than stars in our galaxy.
http://www.jpl.nasa.gov/news/news.cfm?release=2011-147&cid=release_2011-147
Guys who did the survey:
http://www.phys.canterbury.ac.nz/moa/
Mercury's spin orbit resonance on wikipedia:
http://en.wikipedia.org/wiki/Mercury_(planet)#Spin.E2.80.93orbit_resonance