Super (aka the Windows-Logo key) doesn't work as my base Unity Dash/Launcher keyboard shortcut.
Setting it in ccsm (sudo apt-get install compizconfig-settings-manager) by going to ...
Desktop->Ubuntu Unity Plugin->Launcher->Key to show the Dash, Launcher, and Help Overlay
... doesn't work. ccsm immediately sets-then-unsets it.
As in, if I set the launcher shortcut to, oh, <Super><Alt> (or anything else) it works fine, but if I set it to only <Super>, it immediately unsets itself after I hit OK.
I'm not sure where to go from here.