In AC9, the pet palettes for the arrow tool transformation functions and the element-specific editing functions have been combined. This is awesome.
Here's the Mesh palette:
In past versions, there was one palette which came up under the arrow tool, which had the dragging, mirroring, etc. buttons. Then for each tool there was a different palette which had the buttons for moving a node, curving an edge, filleting, etc. Now, regardless of whether you have the the arrow tool on, an expanded palette appears which has all the buttons of both groups.
This smoothes out the whole editing process because there's a lot less switching to the arrow tool and back.
They also improved the transformation (rotate, etc.) functions of the palette. Now you might actually use them. If you select rotate or mirror, you can select the base point for the transformation, like with the regular command. In 8.1, these palette functions would take as the base point the point where the palette came up, making them IMHO useless.