I'd love to join in on this, but sadly my computer refuses to record from my speaker's audio. The issue seems to be stemming from my USB headphones, I believe. But no matter what I select as the recording device, it always ends up being my mic.
If I do get it up and going, I'll probably record a bunch of TF2, L4D, STALKER, Battlefield 2, Project Reality, Prototype, and what ever else I feel like.
EDIT: Disregard that! I found that if I plug in a second pair of speakers via the sound jacks, I can set THAT to record audio from its speakers, while still having my usb headphones play the sounds back to me.
EDIT2: ... er, no. Apparently that didn't fix it. I can record my speaker's audio with audacity, but the little recording program isn't having any of that shit.