For those of you with unlimited text messaging on your cell phones, you can text "select" to 467467, you'll be asked to verify your mailing address and then you'll receive a coupon for a free can of Campbell's Select Harvest Soup. Allow up to 4 weeks for delivery.
This promotion has been going on for a few months, but it appears to still be working. I don't do text messaging right now (Yes, I know, I'm still back in the "Dark Ages"!), so I couldn't test it out myself. If you try it, let us know how it works for you.