If you haven’t heard about the Web 2.0 by now you must have been living in a cave for a while! It’s a very successful meme that was created for a conference. Tim O’Reilly has the detailed story in this post. My definition, beside the technological features like AJAX, RSS and REST, would be: “A new generation of Web sites leveraging the Web as their main engine”.
The Restlets were designed with REST in mind as well as the idea to solve the performance issues with Servlets (can’t leverage the NIO non-blocking mode, in-memory session limit scalability and availability). The framework is indeed an excellent fit for open services that are typical of Web 2.0 sites.
If you are still wondering how Restlets fits in the Web 2.0 picture, you can check this post from Dion Hinchcliffe. Dion maintains an active blog dedicated to the Web 2.0, from a SOA and Web services point of view.