We recently faced a big challenge by migrating one of our biggest application from Client-Server to a Web architecture. We developed this app by adopting some EMF technologies (such as EMF Edit, Parsley, CDO, etc..) and some good practices like Inversion of Control (with Google Guice) and MVP pattern. And we were really surprised how easily we realized this porting, since we replaced both UI and persistence layers in a matter of a few days.
EMF Parsley is a GUI renderer built on top of EMF that allows developers to quickly develop User Interfaces. The main goal of the Project is to provide an easy way to build complex applications, hiding some boring details, with simple and powerful APIs. EMF Parsley in fact provides some built-in components like Trees, Tables and Forms that can be easily mashed up and customized.