Unity Standard Shortcuts: Make it easier for Windows users
Windows users are used to certain standard shortcuts. It could be less complicated for them coming over if Ubuntu would start to mimic some of those...
Alt+F4 to close a window (which is the same standard we are already using)
Others are for example:
Alt+Enter to switch between fullscreen/windowed (we have no default 4 that, but a CCSM option: CCSM->Extra WM Actions->Toggle Fullscreen)
Ctrl+Alt+Del to open the task manager (we have no shortcut for that, and Ctrl+Alt+Del invokes the logout dialogue, which of course will frustrate windows users trying Ubuntu)
see also: bug 890747
I think those 2 mentioned above are the most important ones, which come to mind and frustrated myself a longer while ago, when I first tried GNU/Linux. Of course an experienced user can change that behaviour easily, but this bug report is not about them... ;)