I also commute one hour each way. I bring a laptop with wireless internet. I get all my work emails answered, do a bit of shopping, browse some blogs, BB, etc etc, and generally relax and get all that stuff done on the train... You can do your online grocery shopping during this time too, and do some meal planning if required. Pay bills, etc etc etc.
Well that's a good use of your time... Very responsible! I'm impressed! I just space out and bury myself in the Kindle