HiYo, from Incredimail, is a free add-on for Windows Live Messenger, giving you tons of cool Winks, Emoticons, Animations, Sound FX, Display Pictures (Avatars), Nudges, Text FX, Audibles, and more to upgrade your MSN Messenger experience.

* HiYo is loaded with tons of free animated Emoticons
* Find any Emoticon, Wink, Animation, Sound Effect, Audible or Nudge easily
* Send HiYo’s crazy Winks to move and shake your buddy’s conversation window
* Replace your old Display Pictures with cool animated slideshows
* Send the most hilarious Audibles to your friends on MSN Messenger

Download the one for your Messenger version from  HomePage.

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