Here's a few from my collection.....mostly utilities
System Information for Windows (SIW) Link
Tells you everything about your static computer you could possibly want to know.
Whats Running Link
Real time look at what programs are running, startup files, processes etc.
Chrono Shutdown Link
Cobian Backup Link
Great Backup Utility
Lets you control the size of program windows.
XML editor...great for those of us who can't code
My all-time favorite system monitor. Easy to skin.
Shows your Outlook Calendar and Tasks right on your desktop.
A.F.5. Rename Your Files Link
I've used a lot of file renamers and this ones the best I've come across.
My choice for IRC
The Godfather Link
The absolute best music organizer out there.
Omega Drivers Link
ATI or Nvidia.......these are THE tweaked video drivers
Lets you add wallpaper to explorer windows.
Faststone Image Viewer Link
I take a LOT of photos and couldn't live without this program.
Neat Image Link
If your a Photographer you'll want to buy the full version.
Many of the above links I originally got from someone else here. Thanks
There are some I didn't include because they just too common like Winamp, CursorXP, Yahoo Widgets (Konfabulator), Desktop Sidebar, Samurize, etc.