If you haven't been following ABC's Lost or don't want to be spoiled, stop reading now.
So what exactly was that map that Locke saw projected on the wall when the timer ran down? I'm already suspicious that the man they know only as Henry Gale did more than simply enter The Numbers when he was alone in the other room with the computer.
The map clearly shows the station known as The Swan at the bottom, along with "I AM HERE". The station at the upper left looks like it might be The Arrow, which is the hatch that the tailies stopped at on their way back from the other side of the island. But what is that mysterious center point toward which all the stations seem to be tunneling? And what is the scribbled out station in white near the top? Could that be where The Incident occurred?
UPDATE: I found this picture of the hatch diagram with the text written in.