SparkPeople and Kiva
I have joined SparkPeople at the suggestion of another donkey-riding gal who is trying to lose weight for her mount's sake. It is wonderful!
If you join, look for me - I'm TIKKI-N-ME over there.
It's like Ravelry, but for nutrition and exercise - lots of easy, motivating tools to help you live a healthy lifestyle. Like Ravelry, it'll suck you in for two or three days while you learn your way around and get your preferences set up, but it's worth it! Enjoy!
At Kary's suggestion, I have also joined Kiva - a site that helps aspiring entrepreneurs in developing countries receive direct loans from those who can help - no wasteful overhead in fundraising. When your loan is repaid, you can help another person, one-to-one. What a wonderful idea. (Kary is always a great inspiration for ways to help the world be a better place!)
Hope your day is as motivating as mine! I am now off to KNIT, to put some oil in my lamp. Maybe I will have something to show for it next time...