Site Name: Meebo
Instant Messaging has become an accepted way to communicate for all of us (not just those born after 1994) Meebo is a way for us to IM each other without having to worry about proprietary software. You can IM through a variety of IM services including Yahoo, AOL, Google and MSN. You can do all of this through a web browser. Very slick...
If you develop websites, you might want to also check out the Meebo me widget. A widget is a small application that you can place on your website by copying generated code from the widget producer. Meebo has created one for IMing. You can place the Meebo Me widget on your website and have people IM you through your website. It is an inexpensive way to provide virtual reference.