With Steam support for Linux, there will most likely be a whole lot more games coming out for Ubuntu and its consorts. While the database of games with Linux support still grows, many titles are already available. To install Steam
Opera is not present in the default Ubuntu repositories, however it is available by ppa. Open a terminal and run the following commands: wget -O - http://deb.opera.com/archive.key | sudo apt-key add - sudo sh -c 'echo "deb http://deb.opera.com/opera/ stable non-free"