Migrating to YUI 3
Its been a long long time but we finally migrated 95% (Scheduler is still on YUI 2) of all the client side code to use YUI 3. YUI 3 has been out for a few years now, but it was always lower on the priority list to migrate. There was always a better feature to build or the excuse of not wanting to break something that already works (see "If it ain't broke, don't fix it" rule).
However, it was getting harder and harder to rely on the old, unsupported YUI to build new features into the site. Now that we have upgraded, we get the latest performance enhancements, full community support on an active project and new utiltizies and widgets to build exciting new features.
You probably will not notice much of a difference on the site, but we think that's a good thing. Stay tuned for exciting new features that take advantage of this great library.