After my first run into Linux (3 years ago), I started looking for a defrag tool. I was using a lot of space for video and iso images and I was sure that my drive needed to be defragmented.
Low and behold I found article after article insisting that Linux didn't need to be defragmented. That the OS would constantly monitor the drive for fragmentation. Well, I heard that with Windows 2000 and with Windows XP did that too and it does work the same.