I do not watch Chuck - come on, how can you resist CBS's The Big Bang Theory and How I Met Your Mother? - but a lot of people say it's an awesome show.
So supporters of the show have started a Facebook campaign to get everyone to buy a sandwich from Subway, which has a placement deal on the show, and write on comment cards that NBC should give Chuck another season or two or that you are participating in the Chucktv.net campaign. You can do it for your lunch, dinner, or both.
I may buy a footlong for my dinner, since I brought my lunch. I may not watch Chuck, but the support that it has is enough for me to believe in it. Who knows? Maybe I will actually watch the show.