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Jon and others are right. OS X does not necessarily need defragmentation. I have used iDefrag shareware utility in the past with Tiger and never found defragmentation to be serious. It was always light, usually below 1%. As other posters said, disk fragmentation under OS X does not interfere with computer functionality or speed. If you still think you might need defragmenting the disk once in a while, here's the link to iDefrag:
www.coriolis-systems.com/iDefrag.php