Amazed and shocked when I have sneaked a look at PrimeFaces, a JSF component library. There are a few highlights of PrimeFaces I quite like.

• A lightweight UI framework and not coupled with a middleware framework like Spring, EJBs or similar!
• PrimeFaces is Spring ROO's only supports in JSF addon!
• Support mobile devices based on jQuery Mobile!
• Work with Google App Engine!
• Holy cow!

What's your comments? What's your view comparing it to GWT and other UI framework?