Meebo: AJAX-based multi-client IM service

There's no security or privacy policy in place yet (so you may want to test it with a temp account or two), but if you want to log in to multiple IM accounts from a single browser window, check out meebo, an AJAX based service that gives you access to AIM, Yahoo, ICQ and MSN. It's only an alpha, but it seems to work very well, and could be the perfect way to IM from behind corporate firewalls or on public internet terminals that don't have IM clients installed.