Om Malik points us to a pretty interesting startup company based in the Bay Area, Tello.  The premise behind Tello’s technology is to provide us a sense of where a particular contact is available.  In other words “Presence”, as Om notes.  He points to several interesting articles, one from the Wall Street Journal and another from BusinessWeek, that describe the technology in greater detail.  After sifting through these articles, I think I came to the same conclusion as Om did; this is great stuff, but I’m not sure how many people will adopt it….and the key to success in this type of technology is blanket adoption.