I think this is not really widely known as of yet. At least I wasn’t really aware of it. Google, on Google Video has a nice collection of Tech Talks. Talks (on video) by people working on interesting software projects. Of course there are a number of Python talks from Guido van Rossum (who works for Google right now), but there’s many others. Each of them is about an hour to an hour and a half. You can find the list here.
A selection of ones I watched or intend to watch:
Camino (Mac browser)
Actually I’m only on page 3 out of 11 of these tech talks. I suggest you have a look yourself for more interesting ones ;)