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Looking further I see in the fine print that this discussion was created for logged-in users only. Also that it doesn't appear in the summaries on the/. home page. The google link said "Log In Nickname Password Public Terminal Slashdot" and was to http://slashdot.org/submission/1011227/Microsoft-Bing-goes-live whereas the ordinary stories are under slashdot.org/story/
Somehow google is searching the submissions.