Geesee
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Geesee is a centralized online address-free chat service. Users from all over the world can connect to the service from various entry points, and each user can choose a topic to talk about. Every user can search rooms around the world and know immediately how many people are communicating about that topic at that moment.
update 1/11/2007:
Geesee is now in public beta.
☍ 30.08.2006