If you’re a softwared developer, you’ve got to join Jeff and Joel’s Stack Overflow. Here’s just an example why. I was struggling with a complicated SQL query, so I posted a question on the site. I went into the kitchen to make and drink a cup of coffee. When I came back, I already had a half-dozen answers. After selecting the best response and a few comment/exchanges with its author, I had a superb solution. It’s an amazing resource, and because the site managed to launch (beta) with an amazing number of active members, it already has critical mass. There is nothing quite like it on the web. I wonder now if it could work for disciplines other than software development.