I have been volunteering for Moveon's Leave No Voter Behind project as a phone support person. I got my first call tonight and was able to successfully guide my people to a successful outcome.
I know it is a small task but it really feels great to do something to help out since I don't live in a swing state.
If you do live in a swing state you can sign up here. http://www.moveonpac.org/lnvb/ The tools available make it really easy and you can canvass as much or as little as you want, selecting names as you need them.
The idea of canvassing might make you nervous but it's really not that bad. I went to Iowa for Howard Dean and did it for the first time. I really enjoyed it and I don't consider myself to be very outgoing.