to include in a website, jsjac is pretty nice. (http://blog.jwchat.org/jsjac/) it can be used to replace nearly all of your messaging functionality -- short messages, group messages, and live chat. it's reasonably easy to configure and install, and requires a jabber server running somewhere.
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I don't use one but here's my buddy's company http://24im.com/features/livechat
to include in a website, jsjac is pretty nice. (http://blog.jwchat.org/jsjac/) it can be used to replace nearly all of your messaging functionality -- short messages, group messages, and live chat. it's reasonably easy to configure and install, and requires a jabber server running somewhere.
I'd imagine Campfire is popular.
irc