Ubuntu's Software Center (henceforth USC) is a great concept--a single place from which to download all of your apps with a graphical user interface (GUI), rather than the "sudo apt-get" terminal code that I can never seem to get to work correctly (despite copying and pasting instructions from the website). Moreover, the USC theoretically keeps track of software on your computer so you can easily uninstall software you don't want or don't use. You can even add third party software sources and browse their apps through the center.
