these primarily deal with bindings, templating, etc. For RIA one needs complex even propagation. The difference in my mind is that RIA are much more like a workbench than a horizontal website. In a workbench you have toolbars, menus and panels which can be customized for the complex workflow. Typically such an application has only a couple of views but many possible actions, where as webapps have several views, but only limited number of actions directly affecting what is on the screen.
yes, I'm looking frameworks which have a more SPA approach and don't have the look and feel of a website. Two examples: https://gomockingbird.com is built with cappuccino, http://pixlr.com/ is built with flash. What for example is very hard to do are tables, which are important for enterprise apps. Only ExtJS and YUI approach real desktop quality (scrolling, sorting, filtering) IMO.
