As if the inclusion of Half-Life 2, HL2: Episode One, HL2: Episode Two, Portal, and Team Fortress 2 in Valve's Orange Box didn't already represent one of the most incredible values in video games ever, they've just announced geek troubadour Jonathan Coulton (he of "Baby Got Back" and "Code Monkey" fame – WARNING: MySpace link) has recorded a "surprise" track to be included in that massive package.
But Coulton didn't go it alone. No, he had the help of the Valve design team (who are apparently fans, go figure) so we can surely expect something about Zombines eating your brains. At this point, with less than a week to go before the game's (games'? gameses'?) release, we're surprised the track hasn't already made its way to the seedy, illicit , peer-to-peer underbelly of the internet. Hey record industry, you should take notes!