Over at Linux.com web site, Joe 'Zonker' Brockmeier opines on his top ten sysadmin tools.
So there you have it -- my top 10 in order of general usage. There are plenty of other useful tools for admins out there, and a number of other utilities that I use regularly. Maybe some of them are on your top 10 list. Let us know about your most valuable utilities (there need not be 10 of them), and if we publish your work, we'll pay you $100.
Nice to find another vim user. :-)