A More Organized Way To Unzip.
Tasty Unzip is a lightweight OS X application that enhances the way your Mac handles .zip files. With Tasty Unzip installed, click to unzip a file and it replaces the .zip file with the contents it contained. No more hunting for files once you unzip them. There is also an option to auto-delete the .zip archive after you unzip it.
Demo for Mac OS 10.4 (Tiger) and 10.5 (Leopard)