Congrats to Ben Weiner and Kelly Korevec for the public launch of dailymile.com. I admire the way dailymile focuses on building user communities around events. The UI is easy to use and intuitive, and they've amassed a good userbase while in private beta. I especially like the feature where users can submit events, and this is something we're contemplating doing here at Active too.
You can read about their launch here.
update: turns out we have an older feature that allows users to submit events here.