Even though I haven't actually seen it in person, I've been a big fan of Apple's App Wall at WWDC every year; they've hooked up a bunch of servers and Mac pros in order to create an animated set of App Store icons that shows real-time purchases in a very visual way. Now, I can have a little piece of the App Wall on my Mac at home; a Polish developer named iApp has created an AppWall screensaver that's now available for a free download. We got in touch with App's Peter Tuszynski who confirmed that, while it doesn't work exactly like the official App Wall (it won't show you real-time purchases), the screensaver really does pull icons from top free or top paid apps by way of an option choice, and then it displays those icons on an ever-changing screensaver display.
It's very cool. I downloaded it on my MacBook, and while the saver does take a little while to load up (it has to pull in all of those icons every time it starts up), it's a reasonable facsimile of Apple's official display. And you don't even have to buy tickets to San Francisco to see it! The screensaver is available for free right now. If the site's being hammered, just give it some time to recover from the traffic. There are also icons on the site that hint that Apple will bring this to the iPhone and iPad "soon," so we'll stay tuned and see what they've got planned.