Nimbuzz has created the first multi-network IM app for BlackBerry smartphones available in the RIM App World store. Because it's design as a native BlackBerry app, it can run in the background and push notifications to the phone much like their iPhone and Android apps can.
This is the first version, and currently only supports instant messaging conversations. VoIP support is promised in a future update.
Nimbuzz for BlackBerry supports IM via Skype, Google Talk, Yahoo! Messenger, Windows Live Messenger, Facebook and MySpace. The app is free, and will work on all BlackBerry smartphones running OS 4.6 or higher, including the Pearl Flip, Curbe, Bold, Storm and Tour.
Want Nimbuzz for your BlackBerry?
Get it here.