-Added performance option in Video Settings in the "Options" menu, which can be set to: Max FPS, Balanced or Power saver.
-Removed Humans, (Mentioned as "Removed Herobrine" in the patch log by Notch as a joke.)
-Made the recipe sizes for Glowstone and Cloth blocks 2x2, instead of 3x3.
-Boats float up to the surface quicker than before
-Destroying a boat will no longer spawn the player too low.
-Boats falling down into water lose their vertical momentum very fast.
-Shift-clicking a tool into a chest no longer restores it to full use.
1.6.5~ Added: May 28, 2011
-You can now climb stairs and slabs while sneaking. (Holding Shift)
-Players that were riding anything or sleeping in anything will stop doing so when they leave the game now, meaning they will not be doing so when they return to the game.
-Shift-clicking an item in the crafting window now only moves the crafted item into the player's inventory.
-The Version number is no longer displayed while playing. It is still visible on title screen and in F3 mode.
-The effect of sneaking is decreased.
-The Advanced OpenGL was re-added.
-The frame-rate cap can now be changed, with toggles of 40 FPS, 90 FPS and 200 FPS.