Hey cool!
If you are going to partition your hard disk again, maybe set aside a 2 gigabyte partition for "testing" other Linux Distros. This way you can have a working Linux, that you leave alone so you always have a working computer. And the other partition just for testing, and breaking things.
Part of the fun is shopping around. Here is agreat site to get an overview of things:
http://distrowatch.com/
Notice the bar on the right, that list will show you the most popular Linux distro.
There are thousands of ways to partition the hard disk. There are actually book written on the subject. I just do this simple Scheme:
partion 1: Main Linux distro
partition 2: Secondary linux distro
partition 3: a Swap partition usually double the amount of your physical ram. This is the same thing as the windows page file.
partition 4: your /home partition.
The point of me showing the /home partition is a cool trick.This is where all of your allplications will store there settings. It will also have your "My documents", and all of your other user files. This will make so you can try a new distro, and not have to reset all of your Firefox bookmarks, or preferences. All of your inkscape settings will be available. On your first boot up of a new distro, you will already have your Desktop icons, and everything else.
Here is an easy to follow guide:
http://www.control-escape.com/linux/lx-partition.html
The main partitions are the root partitions. aka /
Hope that helps!
It really is a fun way to use your computer.
Ask anytime. I love helping new linux people <img src="{SMILIES_PATH}/icon_e_smile.gif" alt=":)" title="Smile">