A quick note here about my run on 12/9.
I am suffering from a really bad head cold, and so I was cramming lots of rest in around this run. I also had a gig playing for the school I once attended, so I decided I would get a quick three or four miles in, so that I didn't have truly awful numbers this week.
I actually felt quite a bit better after the run -- although I was much more tired at the end of the evening. Since I've been running I usually will continue to run through common colds, although I won't generally run if I have a fever. It has been an interesting experience that really makes me feel solid in the knowledge that I'm more powerful than an irritating little sickness.