ambient findability
n. The ability to find anyone or anything from anywhere at anytime.
Examples
2005
First, as to blogging. Alan references my recent Are We Blogging Each Other to Death? posting and says that he detects in it an undertone of, as he puts it, "What's it all about? This whole blogging nonsense?" Well I have a startling revelation for Alan: this is called critical thought. Blame one of the finest educational systems on earth if you like, but I am proud to say that it's the "undertone" of everything I have done, written, or published for the past 25 years: "What's it all about? This whole BlackBerry nonsense?" — "What's it all about? This whole 'social software' nonsense?" — "What's it all about? This whole 'ambient findability' nonsense?" Yes, yes, yes. Until proven otherwise, all emperors are naked.
—Jeremy Geelan, “Can Blogging Change the World?,” LinuxWorld Magazine, November 27, 2005
2004
"Ambient findability is the future," Wodtke insists. "Do you recall before the internet, when you'd be at a party and you'd be arguing if Winona Ryder was in Alien, or if there was any difference between a pachyderm and an elephant? It doesn't happen any more - with the net almost all questions can be answered. The next day you get online and then you e-mail your friend to say that you were right, Winona was in Alien: Resurrection, and they owe you five bucks. Next you're going to want that knowledge at the party, and with web-enabled phones, there is no reason why you shouldn't have it.
—Angus Batey, “Connected, or confused?,” The Times (London), June 24, 2004
2002 (earliest)
Having achieved this network nirvana, the question is inevitable: what's next? For an information architect with library roots, the answer is obvious: ambient findability.

I want to be able to find anything, anywhere, anytime.

What's surprising is how close we are to making this impossibly strange dream a reality. Ambient interfaces, sensors and small tech are about to intertwingle the physical and virtual worlds in shocking ways that will make history of the Diamond Age.
—Peter Morville, “Ambient Findability,” Sematic Studios, August 28, 2002
Notes
This phrase was invented and popularized by the writer, consultant, and information architect Peter Morville, who recently published the book Ambient Findability to much acclaim.