Web 2.0 has taken on buzzword status. It's now shorthand for everything that is new, cutting-edge, and gaining momentum online. Web 2.0 can describe particular Web sites; cultural trends like social networking, blogging, or podcasting; or the underlying technology that makes today's coolest Web applications possible. Many Web 2.0 innovations were pioneered by behemoths like Google, Amazon, Apple, YouTube, and MySpace. But even the smallest, leanest...