Replacing the office keys with iPhones, N1s and Twilio

Kind of like Brad Fitzpatrick's Android proximity garage door opener? http://brad.livejournal.com/2394220.html

Sure, but that's much less fun. (and this router is currently only $60 shipped from Newegg -- that, plus maybe $10 worth of Radioshack components).

There's probably a more elegant solution, but I doubt there's a cheaper one (at such a low quantity)

Then the lab wouldn't be too useful anyway and the existing keycard system would also be up a creek.