I think, that I don't need to introduce GetDeb.net website where you can find a lot of latest packages which you can easy install in Ubuntu. Downloading every package "by hands" isn't convenient so I will show you how to add GetDeb repository to your Ubuntu which allow you to install new applications by one command in Terminal.

Just type in the console the command (or paste using shortcut Ctrl+Shift+V):

echo "deb http://getdeb.masio.com.mx/ jaunty/" | sudo tee -a /etc/apt/sources.list.d/getdeb.list && sudo apt-get update