If you’ve ever used Meebo.com, you have no excuse not to know what this is and should be pumped to go get it and install it on your phone. For those who don’t know what Meebo is, it’s simple: Meebo is every instant messenger, everywhere. You sign in to one Meebo.com account, and it can sign you in to all other messengers (AIM, Yahoo, Facebook, etc…).
You don’t even need a meebo account if you don’t really want one, you can just use their interface to sign in to one program. Meebo has a beautiful interface, and can easily help you keep things straight when you have several conversations going on at once. If you’re an IM’er, my recommendation falls solely in the Meebo camp.