I use JKDefrag GUI & AusLogics Disk Defrag.
The Great Defrag Shootout: The Winners
http://donnedwards.openaccess.co.za/2007/09/great-defrag-shootout-winners.html
The Great Defrag Shootout: The Winners
http://donnedwards.openaccess.co.za/2007/09/great-defrag-shootout-winners.html