I'm trying out 43 Things and it's very addictive. It's a great way to keep track of and share things that you want to do. What adds to the stickiness of the whole thing is that you're sharing your list. Making a goal public is a way to increase the pressure (and support) to get things done. It's helped me already as I'm starting to blog more. One thing that will be interesting to see is how much I continue to use it and if I spend more time looking at other people's goals which can take away from completing my goals. But if spending time on 43 Things helps other people meet their goals, then it's time that I've spent very well.