Nice...but I will also add that little table top audio setup you got there...H4n + hell of a little tripod Best sound so far IMHO!
I think for the vast majority of sound Chris got it from the close lav mics we were wearing (recorded on one of the AF10 cams...) the digital recorder is really only used as backup most of the time (although I don't know that for a fact since I don't sit over Chris' shoulder when he edits).
In addition to the 4 video sources plus the screenshots, Chris has the digital recorder and we also record sound on the Macs when we are doing screen captures (although that's only for the onboard video/audio which is used primarily to help Chris sync the audio).
In the grand scheme of things the production values we use are far more advanced than most video tutorials...and really all the credit goes to Chris keeping all this stuff together and usable (and well edited–you have no idea how well Chris does making us seem intelligent in the final cut).
We do have a lot of experience and we're pretty good at it at this stage...we've been doing this stuff for a long time and the tech keeps getting better in both video and audio quality.
That and HD delivery...which of course causes issues with delivery and fulfillment–which we do honestly regret. We wish nobody had any issues downloading but it's not a perfect art at the moment.