I guess I was more about "power computing" before the Internet came and stole away my attention. Now I have a really big hard drive and nothing to organize it. Before, my system was tight, and keeping it up was a big part of the computing experience.
So, I ask you: what are your favorite utilities? What programs have changed the way you work, altered an OS interface in a key way, fixed something that's busted, or allowed you to do things you couldn't do before? Here's my list: Ghost, Partition Magic, POPFile, SecureCRT, and VNC.