We're huge fans of 'Portal', that mind-bending game featured on Xbox from uber-geeks Valve.

So when we heard that someone went all super-nerd and made a ringer, text message notification and voice mail announcement in .mp3format , well, our little geek hearts exploded.

Not only can you grab them free, you can read the tutorial on how to make your own simulated GLaDOS voice using some software trickery.

We have to say, the ringer here is especially sweet--nothing like hearing the mechanical GLaDOS mocking you as your phone rings. Read about 'em here, the downloads are on the right of that page.