Okay, I knew I should have expanded the comments, because this is basically the same point I just tried to make. ;)

And about the capturing setup -- don't forget that David is going to this extra level of effort, splicing his audio out separately, AND the game audio out separately, which (while nice) a stream could probably do without, and I'd bet that most do.... Really all you need is Google Plus itself, it streams directly to youtube if you aren't interested in editing.... and even if you are, I'm pretty confident you could do it with FRAPS and MAYBE a second laptop for your microphone.... though I admit I'm kind of beat at the moment and less able to tease the theory all out than I thought I would be at the start of this paragraph. ;p