Last week the Android client for IBM Connections was released in to the Android Market, over the last 24 hours the Blackberry and iOS apps found their way in to their respective app stores as well.
Remember you need to install the Mobile Fix on your IBM Connections 3.0.1 Servers before you can use the clients.
The IBM clients limit you to connecting to one Connections instance which should cover most people, if you need to connect to multiple Connections instances you can always check out iWildFire which supports multiple instances.
Direct Links to Clients