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Open a discussionboard popup and add comments on any Web sites.
Zpeech is a message board service you kick off with a URL. It's like Yaplet, but not as rapid fire.
coComment is now open to everyone, and with a handful of new features.
Meebo Rooms is a very nice embeddable chat room for blogs and Web sites.
Want to chat with your fellow intra-Web cohorts? Give these five services a try.