Looks like we got:
Dimension Styles
Cursor-Centric Zooming (YAY!)
Enhanced Top Down Performance
Toggleable AutoRegen (I think this is very nice, far less CPU hit).
Adobe 3D PDF
That's pretty swanky for a 9.1 release.
I'd like to make a suggestion that there be compiled a FULL, COMPLETE, DETAILED list of all major, minor, trivial, insignificant changes/fixes/patches.
I, like many here, have stumbled upon little tweaks in commands I'd been avoiding because they did not work quite right, that got "fixed" w/o fanfare for who knows how long before I didn't skip right to the workaround.
Jim