MY RECOMMENDATIONS to ANYONE USING a Mac! (Free):
iDupe 1.5 ( for iTunes 5.0) //
iDupe is a smart duplicates scanner for iTunes. It tries to deal with duplicate songs or albums in iTunes in a smart way.
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OmniDiskSweeper 1.5 //
Utility for quickly finding and deleting big, useless files and thus making space on your hard disks.
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MemoryStick 1.3.4 //
View your RAM usage in Mac OS X by providing a graphical display of RAM usage.