Bethesda bought the full rights to the Fallout franchise from Interplay a time back. Interplay retained the rights to all previously published Fallout games, and was allowed to continue selling the Fallouts that had been released. In the fallout (pun intended) from the legal issues over...
Alternatively, you can hit enter to bring up the chatbox, type in your message, and hit Shift+Enter to send the message.
Oh, and I believe I was the resident lurker (Slizzo) :D