I'm just about done with my second Extjs theme, I can release this one back to the Sencha community, which I hope to do in the next few weeks. I tried to take UI elements that I like from several different platforms and then implement them together in a normalized experience.

On the Sencha note, I'll be going to SenchaCon this month, it looks like an incredible series of talks, demonstrations and discussions, I can't wait. From their site:

Get ready for the next wave of web app development! Join the Sencha team and community this November and get up to speed on the latest in web app frameworks and technologies.

Three days and three intensive tracks covering everything from HTML5 essentials to developing web apps for touchscreens. We look forward to seeing you there!