Hello. I've been playing around with yui-ext, and it looks very nice. I'm a little confused about the areas that seem to overlap with YUI. In general they seem to replace rather than extend their YUI counterparts.
- BasicDialog and Dialog - both handle some similar tasks, e.g. creating an IFRAME behind the dialog
- Element and YAHOO.util.DOM
- EventObject and YAHOO.util.Event
- DatePicker and YAHOO.widget.Calendar
It might help to have a page in the documentation that describes where you use one instead of the other.