You may have heard that Google is helping fund the $30m Lunar X Prize to land on the moon, and has today launched its own $10m innovation ideas prize. So what’s going on here? Well, if you’re interested there’s an excellent new podcast (.mp3, 34Mb) that explains. It’s an hour-long Long Now talk by Peter Diamandis of the X Prize Foundation, given in Sept 2008 — on the power of competitive cash prizes to spur innovation, how they can be made to work, the best sort of problems they can be applied to, and some ideas for future “Long-term X-Prizes” in the $1-billion prize-money range.