I thoroughly recommend Linux Mint 11. Its easy to install and easy to use plus it comes with much of the software you are likely to need preinstalled
Linux Mint 11 Download
http://www.linuxmint.com/edition.php?id=81
Linux Mint 11 Release Notes/Installation Guide/User Guide
http://linuxmint.com/rel_katya.php
Also worth considering is Linux Mint Debian Edition
Linux Mint Debian Edition Download
http://www.linuxmint.com/edition.php?id=88
Manual partitioning guide for Linux Mint Debian Edition
http://www.linuxbsdos.com/2010/12/28/manual-disk-partitioning-guide-for-linux-mint-debian-edition/
You download the ISO. image of Linux Mint 11 or Linux Mint Debian Edition then you need to create a Bootable LiveDVD
https://help.ubuntu.com/community/BurningIsoHowto
Linux Mint 11 and Linux Mint Debian Edition can also be run straight from the LiveDVD without touching your Hard Drive
LUg.