Soooo, I did no running on Friday or today.  On Friday I woke up and found the muscles of my upper leg hurting something fierce, and that continued on through today.  Friday it was all I could do to keep from noticeably limping.  I figure it is best to err on the side of caution and let my legs heal from whatever is going on rather than possibly aggravate it.  Hopefully I can try jogging again tomorrow.   I guess I was more worn out after the short jog than I thought.  What was it, lack of stretching?  Ugh, I must be really out of shape.