The Silent Number: Top things to do after installing Ubuntu Linux 9.10 Karmic Koala
http://blog.thesilentnumber.me/2009/09/top-things-to-do-after-installing.html

This list of the top things to do immediately after installing your newly acquired copy of Ubuntu doubles as a general list of great software to try out and use, complete with links to any special instructions on how to set them up... Repositories can be added easily ... Feel free to pick and choose; enjoy! You generally don't need antivirus with Linux, but if you'd like to play it safe, you can install the ClamTK Virus Scanner, a graphical front-end to ClamAV. If you feel the need to have a firewall, Firewall configuration is a graphical front-end for Uncomplicated firewall (ufw). If you'd like to make sure all of your internet traffic is encrypted and anonymous, you can pass it through a proxy by using a Virtual Private Network service like IPREDator. We can't kill the music and movie industries if they can make money just by suing all of us! Mozilla Firefox 3.5 brings some major improvements like..., but we all hate how bloated it is. If you want something faster and more...