Yahoo! Design Pattern Library and UI controls

Yahoo! has just released a Design Pattern Library which provides some very good guidelines for using fancy web controls, and they’ve also released their own JavaScript library: Yahoo! UI Library. The Yahoo! UI Library has a number of the same sorts of features that you’d get from MochiKit or Dojo. It’s also well-documented, which is a bonus. It doesn’t have the “pythonic” set of functions that MochiKit offers or the overwhelming completeness of Dojo, but it looks like a respectable entrant in the JavaScript library space. It also carries a BSD license, so it can be freely used for anything!