Lightroom's publish collections allow one to publish photos to various places by simply adding a photo into the appropriate collection. In this example, I use SmugMug, and I have my various SmugMug galleries setup so that they show under my SmugMug publish collection. When I want to add a photo to my Seattle gallery, I drag it there. When I want to add a photo to my Portland gallery, I drag it over there. And so on.
My current practice is that I don't always go and publish a gallery as soon as I add a photo. Is there a way to have Lightroom easily show me those publish collection galleries which have pending updates?