While there are quite a few contenders in the IM client market for BlackBerrys there is always room for one more. The latest to join in IMO with their multi-network IM client in a public beta. Their client supports 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.
The beta of IMO for BlackBerry is not yet in App World but you can download for free at: