Some tools people probably don't know about which they should know about :)
Office 2003/XP Add-in: Remove Hidden Data
http://www.microsoft.com/downloads/details.aspx?FamilyID=144e54ed-d43e-42ca-bc7b-5446d34e5360&displaylang=en
Speaks for itself, it removes the hidden data from office documents, from the reviews I've been reading it saves a lot of space.
Stationripper:
http://www.ratajik.com/StationRipper/
Records shoutcast streams to MP3 files, can record a lot of streams at the same time.
Seems like a very handy app to run when your in need of some new mp3 files for your portable mp3 playing device.
Agent Ransack:
http://www.mythicsoft.com/agentransack/default.aspx
The replacement of windows find that I've been using for a while its very good and very fast.
MyIE2:
http://www.myie2.com/html_en/home.htm
The IE replacement, tabbed browsing, popup blocker, skinable, form autofiller, html source viewer ( override annoying protections ), auto translators, search bar, grouping of websites...