Google Latitude is out, giving your friends the ability to tell where you are (or at least where your mobile phone is) 24/7. You can, of course, opt out in whole or in part - updating your location manually, or concealing it altogether. Which should prevent certain awkward conversations ("If that's my mother, tell her I'm not here!")... but maybe at the expense of triggering others ("Exactly why weren't you on Latitude tonight while you were 'working late'?").
If nothing else, Latitude gets us one step closer to a truly negative answer to the question "Google... is there anything they don't know?"
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