Major kudos to not only the fact that Yahoo open sourced some of their UI widgets, but that they did so under the BSD license, allowing even more people to freely use these widgets in their applications.

For example, I can already see how I could use the “TreeView Widget” within Test Run to allow for heirarchical test plans. Not to mention the Calendar Widget to replace the janky one I use now. And if only I had an application that had use for the awesome color picker widget and RGB sliders…

But Yahoo! also has wonderful resources on drag and drop, event capturing and animation. All of which I can see finding their way into applications I write.