1. I've been trying to figure out how to do this for an embarrassingly long time - - to make a Youtube video fill up your browser window (but NOT go fullscreen), modify the URL to include the modified url "watch_popup". So, instead of this typical url:
Type in this:
Read no further if you're suffering Portal fatigue and/or want to avoid Portal spoilers.
2. I used this newfound tool to make a few widescreen wallpaper-sized screengrabs of GLaDOS, Wheatley, and the turrets:
3. Speaking of Portal, go here to download a simple companion cube paper toy.
4. And if you think the puzzles are just too tough, you can watch a full playthrough of the single and multiplayer campaigns in HD here.
5. Finally, here's a wiki devoted to Portal 2 easter eggs.