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http://money.cnn.com/magazines/business2/business2_archive/2007/02/01/8398977/index.htm
SFGate (San Francisco Chronicle)
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2007/03/19/BUG31OM9RN18.DTL
What I find interesting, is that although this clearly is a fad (the public timeline) at the moment, it was born of an actually need for messengers to stay in contact.
Apropos of needs, what may be more interesting is what people do with the API. Even though nothing here is really new, now that so much collective attention has been focused on IMing in a public/semi-public context, I expect more surprises like this to unfold:
http://twittermap.com/twittervision
...or not :-)