We could be on the verge of a Portal or Half-Life announcement, people. All hands on deck.
Valve recently issued a patch for Portal which added a new achievement, "Transmission Received." The patch was purposely vague about what it was adding to Portal, but came the patch notes released via Steam associated with the patch included this: "changed radio transmission frequency to comply with federal and state spectrum management regulations."
Er, what? Exactly. That's most likely the response Valve wants you to have. But gamers have discovered there are 26 "radios" to discover throughout the world of Portal now, objects that weren't there before. These objects are emitting a morse code that fans are furiously working through, attempting to figure out the puzzle Valve has place in front of them.
There are also reports that Half-Life: Episode 2 received a patch, but unlike Portal, there's nothing indicating what might have (or have not) have changed. If there's something to be found, however, no doubt the frenzied Valve fans will have found it very soon.
Watch this message board thread as it develops.
Between this and the PlayStation 3 fiasco, it's been one hell of a weird day.