13-year-old Max has been working on his YouTube download utility for, well, a very long time. He's been plugging away at it over on the IRC channels wheedling experienced programmers into donating their time and energy to help it become real. And now, with a insanely big assist by iPhone developer Pumpkin, it has.
The software is available from Installer.app and you can read more about it at Max's site. Congratulations Max and Pumpkin and everyone else who chipped in on the project.