#513946 by Everett Zufelt and mgifford: Enhance accessibility of progress bar by adding an ARIA live region.

#541568 by brandonojc, mgifford, Everett Zufelt, and sun: Fixed Link to expand / collapse fieldsets has poorly accessible link text.

#561726 by effulgentsia, TwoD, and sun: Make ajax.js and tabledrag.js implement Drupal.detachBehaviors().

#610204 by effulgentsia, Gábor Hojtsy, sun, Damien Tournoud and ksenzee: API changes to support overlays: lays ground work for implementation.

- Patch #605344 by dww: documentation and code style fixes for update manager. This was ready before freeze.

#473268 by David_Rothstein, sun, yoroy, Gábor Hojtsy, cwgordon7, et al.: Allow contextual editing of dang near everything on the page. Also adds a context system to menu local tasks.

#538660 by JacobSingh, dww, JoshuaRogers, adrian, Crell, chx, anarcat, and cwgordon7: Add a functioning Plugin Manager to core. Can you say module installation and updates through the UI? I knew you could! :D

- Patch #556438 by rfay, effulgentsia, sun | quicksketch, Rob Loach, Dries, sun.core, Damien Tournoud: Fixed AJAX/AHAH 'callback' support only works for 'submit' and 'button' elements - Should work for all triggering elements.

- Patch #444344 by kkaefer, sun, Rob Loach: this change introduces a jQuery .once() method which streamlines the way behavior functions work. Previously, we had to manually ensure that an element is only initialized once. Usually, this happens by adding classes and selecting only those elements which do not have that class. However, this process can be separated out into a jQuery ‘filtering’ function which does all the grunt work.

#544418 by merlinofchaos, sun, drewish, quicksketch, et al: Integrate CTools AJAX framework with Drupal to extend (and replace) existing ahah framework. Everything about AJAX/AHAH is more betterer now.

- Patch #310139 by pwolanin, c960657: drupal_query_string_encode() should not call drupal_urlencode().

#474242 by tic2000: Use more specific CSS selectors for Vertical Tabs to prevent breakage by other modules.

#473878 by tic2000: Fix vertical tabs styling which was accidentally mangled in content-region-as-a-block patch.