I realized something that I think is even bigger than uninstalling: There's no software trial mechanism in the App Store. That's always been the spirit of shareware (and a lot of hosted services, too). You install it, kick the tires, and then decide on purchasing before the trial is done. But here, even programs available for trial on the actual developer sites seem only to be available for instant purchase. (The equivalent to a trial period on the iphone I guess is the lite version of an app. I wonder if that will start to be the dominant approach for Mac software, too.)