Valve?s Gabe Newell Has Emailed Wired.com a Picture

The following image showed up in my inbox tonight, courtesy Valve Software cofounder Gabe Newell. What do you make of it?
If you want some hints, you might go check out this page at Valve ARG. The general consensus is that this is part of an alternate reality game to herald the release of Portal 2. [...]

Source: http://www.wired.com/gamelife/2011/04/portal-2-arg-gabe-newell-email/

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