Yahoo! Messenger team launched a new IMVironment this week called "Emoticats".

You can play with the Emoticats by clicking the IMVironment button in your IM window during a conversation. Look for the "Emoticats" listing in the menu.

Once the IMVironment is running, you can use your mouse to browse through the Emoticats gallery that displays portraits of cats in various behaviors bouble click on the cat's portrait and then click the "Insert" button to send the animated emoticat to your friend. There’s also a small Emoticats menu in the lower left corner of the IMV window.

Read more on Yahoo! Messenger Blog