Can I display notifications on my non-primary monitor? Or on both displays? This issue has plagued Growl for ages.  And ML's track record with multiple monitor support isn't great.

But it's worth asking: can I display notification center's badges or alerts on multiple displays, or on the non-primary display?  Plist tricks?
In Growl perferences, under Displays you have a screen dropdown to choose with screen you want the notifications to appear on. The screenshot is from Growl 2.0.1.