John Gruber, on Twitter:

I wish you could delete apps right from the App Store Updates tab. When I see an update is pending for an app I never use, I just want to delete it right there.

This is a good idea, but I think a better solution would be the ability to “Reveal in SpringBoard”. This would give users a quick way to find the app for deletion, but could also be used when you want to move the app out of a folder after an update adds new content to a beloved game or a new feature is introduced in a productivity app that might increase usage.