The CMS Alahup! seems to endorse a lot of the interaction design techniques of Web 2.0 applications (blind ups & downs, yellow flashes, spinning activity icons, etc) even though it appears to be a desktop application. The website states that the interface is based on Flash. So this application may well be an example what can happen when you pair Flash with the standard GUI and AJAX approaches.
Besides of that it also seems to be a very easy to use CMS for smaller and middle sized sites (although I suspect the UI is not very accessible). The documentation for developers seems to be very good as well. On the site there are demo movies, a list of user features and developer features – and a blog. If you like PHP and Smarty then Alahup is worth a look.