JShot is a useful, WebStartable "screenshot" application. It can be installed either with installer, or with WebStart. There are several look and feels available, the default one looks similar to Mac OS X. I tried, however, to switch to Nimbus. It worked without any problems. The application is really responsive and comes with nice features (like FTP upload).
NEW: Online Workhop Effective WebApps without Frameworks is also coming to: MUC Airport.