Release Notes: Fixes for over 80 bugs since 2.66 relating to sculpting, rigid-body physics, user interface, and the game engine.
Release Notes: 12 bugfixes for 2.60.
Release Notes: 3D mouse support and new custom keymap code were added. 140 bugs were fixed since 2.58a.
Release Notes: Around 70 bugs were fixed since the recent stable release in rendering, animation, sculpting, Python, import/export, and the interface.