WereWP

Widgets in WordPress 2.8
I have presented you a very complete tutorial about widgets a few weeks ago, but here are a few others to help you manage your widgets easily:

Creating Widgets in Wordpress 2.8 with the Widget API | WooCamp
A tutorial from Woothemes team, to teach you how to create your own WordPress widgets.

Kaspars Adds Widget Context [...]

General WordPress news

Small Potato Out of Hiding: An Interview with Tung Do

Tutorials and resources

The complete guide to creating widgets in WordPress 2.8

The 960 Grid System Toolbox & Resources | Webdesigner Depot

Themes

Theme: Imagination Fully Customizable WP Theme | WordPress Blogging | Blog Perfume

WP SLIDER WordPress Theme at Bust A Theme

And a bit of fun!

Take a Break, [...]