There's no fuss over diskeeper - I find it to actually be a mediocre defrag utility that takes too bloody long. I prefer Perfect Disk 2000 - it will defrag the system files and MFT, in addition to moving files based on how often they are accessed to the back or front of the disk. With respect to NU - I am certain there will be a version for win2k and you will get a lot of differing opinions concerning whether or not you should use it. I am leaning towards no, simply because of how often NU screws things up and how a screw up in NT means a reinstall because you have an unbootable computer.
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Shrink
92% of the things we worry about don't happen - but the other 8% DO!