#517814 by jmstacey, justinrandell, pwolanin, drewish, Jody Lynn, aaron, dopry, and c960657: Converted File API to stream wrappers, for enhanced private/public file handling, and the ability to reference other storage mechanisms such as s3:// and flicker://.

#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.

#373201 by moshe weitzman, chx, Frando, eaton: Allow renderable array properties to be passed directly to theme functions.

#196862 by Damien Tournoud, et al: Replace COUNT(*) queries with SELECT 1 ... LIMIT 1 queries when all that's required is a check for whether rows exist.

- Patch #147310 by c960657: added tests for private files, fixed a problem with private files and minor improvements.

#323112 by dmitrig01, kkaefer, quicksketch, frando and many many more: Now presenting... Vertical Tabs. Fantastic new UI improvement for node forms and hopefully more in the future.

- Patch #319356 by recidive: clean up hook_nodeapi_ fucntion signatures and documentation because of previous node API clean-ups.

#313213 by maartenvg, Gábor Hojtsy: Add a 'title' attribute for permissions to allow for localization of permission names

#142995 by dopry, drewish, quicksketch, jpetso, and flobruit: Adding hook_file_X(). This is an enabler of lots and lots of goodies. See CHANGELOG.txt for more. Awesome work, guys. :)