The web-based IM service Meebo released a new instant messaging app for Blackberry. Meebo for BlackBerry is free and supported on all 8000 & 9000 series devices. This includes both trackball and touchscreen models. Your device must be running OS 4.5 or better.
You can add IM accounts to your Meebo ID either through the Meebo app or through meebo.com. Once you have added an account in either place, you will be able to see it however you log into Meebo.
Meebo for BlackBerry Features:
# Access your full Meebo chat history with any user.
# Transition seamlessly from a conversation on your BlackBerry to your desktop and back. Synchronized IM sessions, smart notifications, and location control.
# The app works equally well with all BlackBerry models with a trackball or touchscreen.
Download Meebo for BlackBerry