Last year was the first time I'd ever given up anything for Lent. I've just never been in a tradition that does that sort of thing. But last year I had a couple of friends who did it, so I joined in and gave up meat. I think it's a good experience to give up something voluntarily, for a lot of reasons--religious or not.
So this year I'm going to give up meat again. And having seen bits and pieces of it last year on Twitter, I'm also going to do 40 days of Water. The idea is that you drink only water for 40 days, and donate the money you would have spent on other beverages.
Last year I was actually successful in avoiding meat. This year... we'll see.