We're looking to upgrade the Magistra's MacBook to 10.5 because 10.4 cannot run the recently announced Steam games for Mac. As part of the announcement, Portal was free for a couple of weeks, so I decided to boot up Portal and play it again. Portal was indeed a masterpiece, and the Magistra loved it. It is one of the few FPS games she has ever played.
Turns out Valve updated Portal with new goodies, including a new scene in the ending, and added in some hints for Portal 2 via a new achievement, Transmission Achieved. There were radios scattered around in Portal that all played this upbeat little ditty, but now there are many more, and if you take the radios to special places in each level, it plays a message, sometimes in Morse code, sometimes via fax protocol, and so on. From all this, people decoded a BBS number, and using a login/password that was encoded in the Portal 2 announcement, you could login and download more documents from Aperature Science.