661s are useful but they don’t really prevent pedal bites altogether. I’d usually get them near the back of my ankles because the guards are rounded in that area and leave my legs exposed.
Unrelated as it is, here’s a good bruise pic from some weeks back. http://www.unicyclist.com/forums/showpost.php?p=825777&postcount=1
The shiny-ness is due to ointment. I’m not radiating light.