One look in SVN and you will see a lot of new goodies! Some of them are raw (auto-growing InlineEditor), some of them work well but need more testing (QuickTips) and some are well tested and seem to work great (TreePanel!). There's also new features in the Drag Drop package I posted about before. A new class "YAHOO.ext.Layer" that extends Element and provides auto shadows, iframe shiming when needed, viewport constraints for absolute positioned elements. One thing they all have in common is they are undocumented for the most part. Documentation will come as the code stabilizes, and in the meantime I will be making some blog posts and getting feedback when I put together some demos.