I was working today, and realized that there are two more tools that users shouldn't be without.
This handy app extends Windows' contextual menus to include options for creating and opening almost every kind of compressed file you can imagine. Archive types include: .arj, .zip, .tar, .tar.gz, and their very own .ice (fabulous for compressing plain-text files, I found it to be about 300% more effective).
This Win2k/XP/9x tool can reveal passwords hidden behind the stars, dots, and asterisks used by Windows. Invaluable when you forget your Outlook, Outlook Express, and dial-up passwords. I'm sure that it works with a lot of other apps, too.