Belarc Advisor
Builds a detailed profile of your installed software and hardware and displays the results in your Web browser.

ShowIP
Shows ones Private and Public IP address and alerts you of changes.

Folder2MyPC
With this utility you can add any folders or program shortcut to ” My computer ” and “Control panel”

Hamachi
Hamachi is a zero-configuration virtual private networking (VPN) application.

Alarm
Nice free Alarm clock with mp3 support

TrayIt!
Minimize anything each application which applies TrayIt! creates a small icon in the System Tray.

HiderPx
Allows one to reopen a window of any process in the background which “vanished” from the taskbar.

NetStat Live
TCP/IP protocol monitor which can be used to see your exact throughput on both incoming and outgoing data

MaxMem
Realtime physical memory management program that automatically ensures that you always have as much physical memory available as possible.

CacheBooster
CacheBooster allows you to tweak your harddisk caching to help achieve the best possible performance from your system. Win95/98 ONLY

TuneXP
Windows Tweaking software.

CCleaner
Removes unused files from your system – allowing Windows to run faster and freeing up valuable hard disk space and cleans traces of your online activities.

HijackThis
A general homepage hijackers detector and remover.

PuTTY
PuTTY is a free implementation of Telnet and SSH for Win32 and Unix.

Unlocker
Unlocker lets one delete/rename/move a file that is locked by Windows for whatever reason.

µTorrent
A very tiny Bittorrent client and a very powerfull Bittorrent client.

RootkitRevealer
RootkitRevealer is an advanced rootkit detection utility

nlite
nLite is a tool for permanent Windows components removal and pre-installation Windows setup.

Citrus Alarm Clock
Citrus is a software alarm clock which can use your existing Media Player.

TerraIM
TerraIM is a free, lightweight, cross-platform AOL Instant Messenger client.

The Wonderful Icon
Minimize programs onto the taskbar tray instead of just onto the taskbar and much more.

Sizer
Resize any window to an exact, predefined size.

Foxit Reader
Free reader for PDF (Portable Document Format) documents.

IrfanView
Very fast, small, compact and innovative graphic viewer for Windows.

7-Zip
File archiver with high compression ratio.

Autoruns
Autoruns goes way beyond the MSConfig utility bundled with Windows Me and XP.

BurnCDCC
Used to burn an ISO file to a CD/DVD/BD disc.

KeePass Password Safe
Password manager or safe which helps you to manage your passwords in a secure way.

Notepad2
A small, fast and free text editor with syntax highlighting for HTML and other common languages.

Process Explorer
Shows you information about which handles and DLLs processes have opened or loaded.

Pstart
A portable start menu that can be installed on a USB drive or your local PC and provides quick access to programs and documents.

RegSeeker
A powerful registry cleaner and can display various information like your startup entries.

Restoration
Undelete files that were removed from the recycle bin or directly deleted from within Windows.

Steganos LockNote
Hide your serial numbers, passwords, phone numbers and everyday notes in a safe place.

TrueCrypt
Create a virtual encrypted disk within a file and mount it as a virtual drive.

SyncBack Freeware
Small, free, powerful folder syncing utility.

allSnap
Make windows snap to the screen edges and each other.

Angry IP Scanner
Very fast IP scanner and port scanner that can scan IP addresses and their ports in any range.

Gaim
A multi-protocol instant messaging (IM) client.

WinRoll
Make a window roll into its title bar, send it to the tray or make it stay on top.

Taskbar Shuffle
Drag and drop the programs on your Windows taskbar.

SyncToy
Copy, move, rename, and delete files between folders and computers quickly and easily.

desktopListView
Turns your desktop icons into a list for viewing.

StartupList
A simple tool that lists all and every auto starting program on your system.

CDWinder
Media cataloging tool for the Win32 platform.

Power Menu
Adds “Always On Top”, “Minimize To Tray”, “Priority” and “Transparency” sub menus to all top level system menus.

ATnote
“Post-it” type system tray note taking software available in many languages.

AutoHotkey
Write a mouse or keyboard macro by hand or use the macro recorder to automate almost anything.

Launchy
Index the programs in your start menu and can launch your documents, project files, folders, and bookmarks with just a few keystrokes.

ImgBurn
Write CD / DVD images and it supports all the latest writers (including booktype / bitsetting on many of the major ones – i.e. BenQ, LiteOn, NEC, Plextor, Sony)

WinSCP
SFTP client for Windows using SSH.

freeSSHD
free implementation of an SSH server.

Miranda IM
multi protocol instant messenger client for Microsoft Windows.

SlickRun
Instant access to any program or website.

KatMouse
Mouse wheel enhancement for Windows.

Volumouse
Control the sound volume on your system – simply by rolling the wheel of your wheel mouse.

NirCmd
NirCmd is a small yet powerfull command-line utility.

Wallpaper Master
Automatically change your background wallpaper with a huge range of options, and is great for indexing large collections of personal photos or any kind of image.

MWSnap
Small yet powerful Windows program for snapping (capturing) images from selected parts of the screen.

CamStudio
Record all screen and audio activity on your computer and create industry-standard AVI video files and using its built-in SWF Producer; turn those AVIs into Streaming Flash videos.

StrokeIt
Advanced mouse gesture recognition engine and command processor.

ShellEnhancer
enhance the default shell of Windows allows you to make your own tasks and switch between them; tasks can be executed with hotkeys, mouse gestures or screen corners.

RKopie
Create and manage customized backup jobs.

XnView
Utility for viewing and converting graphic files.

4t Tray Minimizer Free
Minimizes to tray any application.

4t HIT Mail Privacy Lite
Hide email within an image.

Active Ports
Monitor all open TCP/IP and UDP ports on the local computer.

A.F.9
Edit files by replacing characters or any other bytes.

Anyone have any other suggestions for the list? I will be happy to add it to this post.