This is an image of the Bootable DVD of Drive Genius v. 2.1.0 required to defragment your Mac. Just extract the file using stuffit and then burn the image using Dis Utility and you're good to go. Restart and boot the Mac using the CD/DVD and you should be able to defrag the boot HD.
Hope it works and is useful!
If anyone's got the 2.1.1 version of the bootable DVD, post the torrent please. I'm trying too.