Yahoo is launching a new version of its popular Yahoo Messenger on Tuesday that lets you forward phone calls and instant messages and watch videos and view photos with friends, among other enhancements. But probably the most popular thing will be the new emoticons.

Yahoo Messenger 9.0 has a redesigned interface with new “skin” background designs and new emoticons for expressions like “thumbs up,” “thumbs down,” and “rock on,” (yes, the little yellow face ball is holding up its second and fourth fingers in the rock-star pose).

Beyond the surface, some of the changes are even more impressive. For instance, it’s easier to call, text or IM contacts by simply hovering over the contact name and clicking. You can also click an arrow to the left of the contact and see a larger version of their avatar, contact them, start an e-mail session, and edit their information. And you can send a text message to someone’s phone using your computer keyboard. These communications features were here before but were just not as apparent or easy as they are now.

You can also forward offline IMs to a mobile device and forward incoming phone calls to a phone number.