Using CatScan you can explore applications and discover how they were created, looking at icons and nibs used to create the interface. Drag in a folder of icons to see them all at once side by side. Uncover new features in the latest Tiger builds by dragging on the new applications and system folder. You will be amazed by the number of unimplemented features that are hinted at through unused nibs and icons. If you find an icon you want to borrow of tweak you can just drag it into the Finder or Photoshop.
CatScan lets you explore the scanned items using it's innovative "Lens" that magnifies the thumbnail under your cursor. By clicking on one of the thumbnails, you can find out what size it is, what format it is in, when it was created and even where it is on your hardrive.