Excite.com was to be purchased by Yahoo in 1998, but they were sold to @Home Network in 1999. And became Excite@Home.
After acquirring Blue Mountain Greeting Cards and sponsoring an Indy Car racing team, the merger of Excite@Home fell short of expectations and in October of 2001 filed for Chapter 11 bankruptcy.
iWon went on to creat an Excite like portal and eventually won a court ruling to acquire the domain and brand. After the go ahead from the court iWon transfered the users over to the new Excite portal. You can read a detailed history in wikipedia .
As for excite chat, I’m not sure.
Hope this helps.
R