The glossary of terms has been completed and can be downloaded in PDF here.
If you prefer HTML, you can view the web version here.
The much anticipated GUI mockups have arrived. There are pictures of the login window, the chat window, and the contact list.
The non-functional requirements were listed in the problem statement, however we have since elaborated on these requirements. You can find the more detailed verstion here in PDF or HTML.
The Use cases were recently completed. There is one diagram for client to server actions, and one diagram for client to client connections. Be sure to look at both diagrams when checking out the use cases. Also, each action has comments with it, so be sure to read those. The Poseidon ZUML file can be obtained here.