This should contain all the major changes.
For minor stuff, refer to the commit log of the repository.
+2011-05-29:
+- Optimized smooth lighting
+- A number of small fixes
+- Added clouds and simple skyboxes
+- The glass block added
+- Added key configuration to config file
+- Player privileges on server
+- Slightly updated map format
+- Player passwords
+- All textures first searched from texture_path
+- Map directory ("map") has been renamed to "world" (just rename it to load an old world)
+- Mouse inversion (invert_mouse)
+- Grass doesn't grow immediately anymore
+- Fence added
+
2011-04-24:
- Smooth lighting with simple ambient occlusion
- Updated main menu