I remember a satellite channel experimenting with the idea of airing playthroughs of games. They were usually abridged to around 3 hours and did not contain the average playthrough banter you get with most LPs. Personally I enjoyed watching it when I with my dad. I have no idea if they're still around though or what the channel was called.
EDIT: I was trying to find it and found references to the show Cinematech although I'm fairly sure I watched a full playthough of Hitman and most of the cutscenes from Far Cry instead of just trailers over the course of 30min.
On Windows my sound drivers include something called stereo mix. You can record this through audacity to get their side of the conversation. To record yourself as well you need to set your mic to playback through your speakers, but then you hear yourself speaking.
There may be a better way, but that's what I've always done if I needed to record on Skype.
As for the varnish plugin I had to edit the gemfile to have
It would be fantastic if it eventually got as simple as their PHP plugin or regular monitoring is to install.