Facebook designers' novel approach to the usual name tag problems
fontsinuse.com
fontsinuse.com
Then I scrolled down to discover the booklet and all its goodies.
Surprise and delight.
This is taking the concept a bit further to be sure, but I don't think this is an innovation of the scale it is being presented to be.
(Also, you're not mistaken, according to the Oxford American Writer's Thesaurus. But they are different words.)
Surely a badge with wi-fi or bluetooth combined with a custom Facebook app would allow for all kinds of useful communication and location within a conference. Is this just too complicated? (On the booklet thing, most hacker cons have mobile con guides for browsing and offline mobile apps for use)
What about a system that would let a user know what seats that their friends are sitting in? That would eliminate the stress that finding a friend in a large conference room is.
As for your second, if you know what your friends look like, you don't need to know exactly where they're sitting, so you don't need RFID. SitBy.Us (http://sitby.us) illustrates this perfectly: if they found a biz dev guy and expanded beyond SXSW & Mozilla Summit Conf, they'd be killing it. If Lanyrd is smart, they'll snap up or clone SitBy.Us.