Here you can find some demos, based on the RIA technology: Microsoft Silverlight. They demonstrate, how interactive the new generation of web applications might be.
Concerning user experience, Silverlight applications can be similar to the best Desktop applications!
Technology demos based on the client side technology, Microsoft Silverlight.
Microsoft Silverlight is a client side technology that enables the development of highly interactive Rich Internet Applications.
CAS Silverlight is a technology demo that showcases the rich functionality (e.g. offline capabilities) of Microsoft Silverlight, by reimplementing some of the features of the SaaS CRM solution of CAS Software AG.