SHAPE Services just announced the release of IM+ Lite for BlackBerry. They have taken a few features out of their popular IM+ All-In-One Messenger and added advertisements to make it free. The app is not shown on their website yet but you can find it on their mobile site at:
IM+ Lite gives access to MSN, Yahoo!, Google Talk, AIM, Jabber, ICQ, Facebook, MySpace, Skype and Twitter from one app. The paid version will still stick around since it adds support for speech recognition and IM+ push notifications.