I'm really tempted to get this, seeing as a new Windows computer for Christmas has been hinted at. I've been meaning to play it for ages. I want to go through it before Skyrim, though, otherwise I think I'll feel disappointed by it.
I've got a 50% off coupon for any Valve game, valid until March 1st. I already own pretty much every Valve game though and I doubt Half-Life 3 is coming before March, so I'd be willing to trade it or sell it or whatever.
Also got a 50% off on the game Cogs, still deciding to use it or not.