Thanks to Max Walker, you can watch the introduction to Node.js that Ryan Dahl presented to the SF PHP Meetup Group last month. Also, if you missed the last SF MongoDB User Group meetup, Dave Edelhart's slides from his presentation on combining the powers of MongoDB and Node are available online. He's also encouraging folks to submit links to their Node-powered games (in whatever stage of development) for the Serverside Javascripters Club's show-and-tell session being organized for the end of April. I'd certainly be happy to help beta test!