To make a little more sense of my question, here are specs:
Pentium III 933 MHz / 640 MB PC133 SDRAM / 20 GB IDE HDD / 128 MB GeForce FX5200 / Windows XP Pro SP3
So, I was looking into Ubuntu and it 'appears' that it would run lighter than XP on my Pentium III machine. However, I know that Ubuntu is a very flexible operating system that may be advantageous to developers or advanced users.
I don't know much about Ubuntu at all, but assuming that it'd run lighter, would installing it be like a Windows installation where you could clean install it off a disk or something? Also, are there any good beginners tutorials for Ubuntu?