I blog about my weight loss journey on Livejournal, and I find that it helps sometimes. Lately I have been posting here more than journaling, however, because the people here really understand and the people who read my LJ don't necessarily know where I'm coming from. Though if you use the 3FC blogs, you'll find an audience who understands the process.
You have to be a member for a month and have 30 posts, I believe, before you can use the tickers. The wait will be over before you know it.