I just bought this software today after hearing a lot of good things about it. It's a defragmenter that's about a zillion times better than the one bundled in Windows; it's immensely faster, plus it lets you defrag drives & partitions that normally you aren't able to. The really cool thing is I have mine set to defrag the drives anytime the screen saving is up. Very handy!
My brother had a "coupon" of sorts, so the download was only $20. Well worth it! I never seem to get around to defragging until I have problems; now it'll do it for me.

Highly recommended!
