So, and excuse the hand waving here, the way it would work is this:
- You'd purchase a cheapo RFID reader from somewhere - the ones from ThinkGeek, Phidget and Parallax all look good.
- Hook it up to a computer and run TheSoftware which, as yet, exists only in my brain. You will tell TheSoftware what the physical location of your card reader is.
- Swipe your brand new card which will prompt you to register yourself with a remote, centralised service.
- This service will prompt you to give it FireEagle access.
- From this point on whenever you swipe your card over the reader TheSoftware will inform the centralised service which will, in turn, tell FireEagle.
In and of itself this is not very useful but if you had a reader at work then you could swipe in there in the morning and then swipe in at home at the end of the day (or if you work somewhere suitably large then put multiple readers around the place). And then if your friends started getting RFID readers and installing them in their homes then when you went round there you'd be able to easily let FireEagle know where you were. Hell if you could persuade your favourite bars and clubs to do it then you could do it there. Hook it up to your Social Graph and then you can easily work out where all your friends are.
Then of course the data can be subpoenaed by the Government to prove that you're a terr'ist or something.