Here’s a great application which i use religiously on my Curve on a daily basis. BeeJive in MY opinion is the best mobile IM app that’s out now. It allows you to stay connected on several different IM accounts simultaneously (AIM/iChat, MSN Live, Yahoo, Gtalk, MySpace, ICQ, Jabber, and even Lotus Sametime). BeeJive doesn’t use text messages, it uses your phone’s data plan (with an unlimited data plan, you type till your fongers fall off). Available for Blackberry devices (also has WiFi support) starting@$20 for a single user license but a 30 day free trial is available to try out. It is free to download for iPhone/iPod Touch and Windows Mobile 6 devices.
Download Here from your mobile devices.