PPAs make it easier to install a lot of software not present in Ubuntu repos. Also, often it happens that a latest version of a program you need is not present in USC, at that moment, the only way to use the latest version is by adding a PPA. Though you can add PPAs from command line, management of PPAs becomes tough once they grow in numbers.
Y PPA Manager provides an easy to use GUI for management, addition, removals and searching of PPAs in your Ubuntu based distro. Also, the most amazing feature about this app is that you can just update the sources of only one PPA (using update-ppa command) thus saving your bandwidth and time.
To install Y PPA Manager:
sudo apt-add-repository ppa:webupd8team/y-ppa-manager
sudo apt-get update
sudo apt-get install y-ppa-manager
To update a single PPA (eg: ppa:webupd8team/y-ppa-manager)
sudo update-ppa ppa:webupd8team/y-ppa-manager