No. We've learned that most Yahoo! Chat users open or enter chats from Yahoo! Messenger, so we are focusing our engineering ingenuity on improving the Yahoo! Chat experience in Messenger. Our priority is to make that experience as personal, productive and effortless as possible.

Don't have Yahoo! Messenger? It's the best IM experience on the web, it's free, and now features voice (that means phone calls – inexpensive ones – or free to another PC!) and better photo and file sharing. Have a look!