While that mysterious ARG message during the Game Developers Conference indicated that we wouldn't get more info on Portal 2 until E3, the truth is that Game Informer's web site has been posting up new articles about Valve's upcoming puzzle shooter sequel on a regular basis for the past couple of weeks,

Some of the articles include how Valve created the test chambers for the game (you can see an example of one above), while another goes into some detail on how the game's main character Chell will be redesigned visually for the sequel. The latest such entry is a partial history of the game's mysterious corporation Aperture Science and how they link up to the Black Mesa facilities in the original Half-Life. Fun stuff, as always.