From Prosoft Engineering:
Maintain, Manage and Optimize your Hard Drive Is your Mac running slower? Is your hard drive filling up and you don't know why? Are you seeing the beach ball more or having other issues with your hard drive? Try Drive Genius 3, the best hard drive utility on the Mac platform - DrivePulse, Enhanced Defrag, DriveSlim, Enhanced Repartition are only a few of the award-winning features of Drive Genius 3. Drive Genius 3 is used by Apple at the Genius Bar as part of the ProCare Yearly Tune Up.