When the BlackBerry PlayBook first released, we discovered a website called imo that let you have multiple IM chats, including Skype. They have now created an app for BlackBerry devices, and are currently in public beta. With imo for BlackBerry, you can connect to all of your IM accounts including AIM, Gtalk, Skype, MSN Messenger, Yahoo!, Hyves, VKontakte and Jabber at once. The app is currently in beta and will get more features in the coming weeks.
It will soon be added to BlackBerry App World. For now, you can download the app for free here https://imo.im/blackberry.