Getting things done while commuting

Continuing the topic from a couple weeks ago where I shared tips on getting work done while traveling, most of us travel some distance to work.  Dumb Little Man offered 7 Productive Things You Can Do While Commuting which helps us use that time better too.  I currently commute by bus with my child and husband and this gives us extra family time, but when I commuted by myself I found it to be a GREAT time to work out problems.  What do you like to do with your commute?