Not sure how many of you paid any attention to that Portal update last night, but it's much more than the description lets on.
- Changed radio transmission frequency to comply with federal and state spectrum management regulations
And that was it. I didn't understand what the hell it meant at first, but basically, new audio files were added to the game, which you can hear by finding the radio in each chamber and taking it to a specific point in the chamber where interference can be heard. Some of the sounds are morse code. Some of them are actually SSTV images, and can be viewed as .jpgs.
The rabbit hole goes much deeper, read more here.
