The extension community of Ext is growing by leaps and bounds. I am continualy amazed at the excellent architecture that Ext gives us to write extensions as well as the authors of extensions.
One problem I see is where to get the extensions from. Some authors have the extensions on their website, some just post in the forums. It would be great if the folks at Ext JS could open up part of their svn repo for extension authors to put their code. That way it would be a one stop shop for extensions. They do this for the Grails project and it works out great.