I searched the App Store for "animated GIF" but the only returned app was one to convert a movie file into an animated GIF. I need to go the other way: I have a series of screenshots taken of an app that I'm a beta tester for. These are the standard PNG files created by OS X's ⌘+⇧+4 keyboard shortcut. They show the sequence of events I use to reproduce a display bug.
When I say "App Store quality" I mean they are native Cocoa apps. These apps generally have attention paid to user interface and usability. You know, all the things that make good Mac apps good.