Bruno is the cutest Jabber/XMPP Instant Messaging (IM) app available. It is a themed version of the open source yaxim app.
You can use Bruno if the other IM apps are just not stylish enough.
Joyful colors: magenta, pink, ice and pine
Connection with a single XMPP server (or GTalk, or Facebook Chat, or )
Immediate reconnection on 3G/WiFi network changes (seamless with XEP-0198)
You are asked about self-signed SSL certificates
Allows automatic connection after turning on your phone
Roster management support
Persistent message history
Message Carbons (XEP-0280)
Bruno is optimized to use the yax.im free XMPP service: http://yaxim.org/yax.im/