The tutorials they provide are small, one trick ponies that allow you to perform tasks like finding your location, building a fire, figuring out your IP address, and more. The site allows you to see a screenshot of the application, read a description, and download the source code to play around with. If you have a developer provisioning file (meaning you've been accepted into the developer program), you can even sync the applications over to your iPhone or iPod touch.
If you are not an iPhone developer and wish to play around with the applications, you will soon be able to download them from the iTunes App Store. For more information about the project, visit the Apps Amuck website.
Thanks for tip, Chris!