Top Ten Reasons to use Ubuntu (written in 2006)
http://midspot.wordpress.com/2006/07/21/top-ten-reasons-to-use-ubuntu/
After Ubuntu, Windows Looks Increasingly Bad, Increasingly Archaic, Increasingly Unfriendly (written in 2007)
http://linux.sys-con.com/node/382946
Both articles are comparatively old as Ubuntu has come on leaps and bounds since then making it even better
I thoroughly recommend Linux Mint 6 Main Edition which is Ubuntu based. Its easy to install and easy to use plus it comes with much of the software you are likely to need preinstalled.
You would be best off RUNNING IT LIVE so you can get the feel of things.
Linux Mint 6 Release notes
http://www.linuxmint.com/rel_felicia_whatsnew.php
Linux Mint 6 Download
http://www.linuxmint.com/edition.php?id=31
Once you have got the feel of things you may wish to consider an installation
The Perfect Desktop - Linux Mint 6 (Felicia)
http://www.howtoforge.com/the-perfect-desktop-linux-mint-6-felicia
You download the ISO. image of Linux Mint 6 then you need to create a Bootable CD from the ISO. This can easily be done using Nero Burning ROM or similar software. Linux Mint can also be run straight from the LiveCD you have created without touching your Hard Drive.
Remember you can RUN IT LIVE !
LUg.