iChat is a great way for Mac users to use AIM, but iChat gets a little hairier to use with Google Talk, MSN Messenger or other chat networks. Adium is the best IM tool available. Enabling iChat for non-AIM protocols generally requires registering for a free account at open source chat provider Jabber.org. Adium connects to AIM as well as Google Talk, MSN, Yahoo Messenger, Jabber and many other protocols. Its all-in-one interface allows for tabbed chats in one window, smooth screename switching capabilities and skinned chatting. Currently, iChat’s primary advantage over Adium is its well-integrated video chatting, but a video chatting plug-in has recently been introduced for Adium as well. If you're not convinced, check the instant messaging category - you are sure to find one that suits your needs.
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