From SourceForge.net: "ZK is an event-driven, XUL-based, Ajax-embedded, all Java framework to enable Web apps the rich user experiences. With ZK, you represent and manipulate RIA with XUL/HTML components all running at server, as simple as you did for years in desktop apps."
ZK is one of the top Java downloads at SourceForge yet I can find no mention of it here at this site. Seems very odd to me.
Anybody had any experience with it? How does it compare to other frameworks for ease of use and features offered?