Although it's not part of our faith tradition a few friends and I decided to take part in Lent this year. I chose to give up soda for the 40 day time period leading up to Easter. After just one day, I'm already craving the stuff like crazy. It'll probably do me well to stay away from the stuff for a while, but I'm definitely going to miss it. I guess that's the point.
And, while I'm on the subject, there's an interesting article about students giving up social networks for Lent on CNN.