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Chat with your Yahoo, Gmail, AOL, and MSN contacts in the same window

Radius IM is the new all ajax online messenger of the block. You can sign up into your yahoo messenger, MSN messenger, AOL and G talk and chat with your contacts in the same window.

Quoting the developers ‘RadiusIM is all about location. It’s a free web service that shows you who’s around and let’s you IM them. Sign up now to see who’s hanging out in your favorite neighborhoods.’

Whats most interesting is the fact that they also have their own direct IM service, which auto-determines your location and places an icon on a Google map embedded in the site.
The best thing yet is the fact that its entirely ajax, and does not require download of any sort. So here is a nice little thing that will keep you occupied.