Review Usability of my SoC Project

Hello,

I am a Summer of Code student working on a project called Embed Widgets (http://drupal.org/project/embed_widgets). It allows widgets to be created from Drupal content such as nodes, blocks, or views. Content must first be added as a "widget source" before it can be embedded in a widget. Widgets can be embedded in various formats such as IFrames and Google Gadgets, with more to come.

My project is going great and is nearly complete, but one concern I have is the user interface. I am looking for ways to improve it.

I have implemented the following features while editing a widget:
-Dynamic user interface using AHAH.
-Live preview of changes made to widget.
-Draggable table to re-order widget tabs.
-Views arguments can be input through UI. Some use autocomplete.

I welcome any suggestions or critiques of the current interface.

You may login to the demo site to test my project: http://deviable.com/widgets/

I am also planning to implement an interface where end-users (non-admins) can create their own widgets. Not as many settings will be available, so this interface will be more simple. If anyone has any suggestions for that interface, please let me know!

Thanks for your help!

John Snow