http://gameinformer.com/mag/portal2.aspx
Each icon is another piece of released data, including articles about its development, video interviews with valve, and a podcast on the subject.... but there is more to come. Worth a read, especially the history of Aperture Science.
If you've not played the Half Life series or Portal then obviously you shouldn't watch this, but instead go buy said games. Of course mentioning half life there in itself is a spoiler, so screw it.