2009

Colored keys
Dope Sheet keys are now displayed as rectangles within boxes so you can easily
spot sub-frame keys, keys that fall in-between frames. Keys that fill the boxes
are on the frame, keys that are small rectangles are sub-frame.
Sub-frame keys
Dope Sheet, just like the Curve Editor, allows you to use soft selection on keys.
This is extremely useful when you are dealing with massive quantities of keys,
Dope Sheet | 3521