Would be terrific if there were a setting to have Growl not post ANY notifications if chosen programmes were running (I'm generally thinking of Quicktime Player, VLC, etc.). I'm not a programmer, but wouldn't have thought it would be too difficult to code, if there was general interest.
Not all displays are visual.
Those applications, and pretty much any others that the user might add to such a list, are not necessarily running full-screen.
We're much more likely to do this.