AllToTray
AllToTray allows you to minimize ANY window to your System Tray. It adds the option -Minimize to Tray- to the System menu of the window. If you have checked this option, this tool will minimize the window to your System Tray any time you minimize it. ... New features : recovers all icons from tray when Explorer crashes, support multiple users, support Afx windows, use hotkey to minimize to tray, new interface, use hotkeys to restore/close all windows from the system tray or close all minimized windows from the tray and taskbar, use hotkey to switch to another minimized window.
http://www.dntsoft.com/alltotray/AttSetup.exe - 585Kb - Download - Screenshot

Auto Window Manager
Auto Window Manager automatically manages any window you specify. For instance, some web browsers open up in a non-maximized window. Using Auto Window Manager,you can set those windows to automatically maximize (minimize, normal, minimize to tray,stay on top) every time they're opened. ... The commands are:Minimize to system tray, always keep window on top, Set window transparency, align window, resize window. ... Auto Window Manager stays running in the system tray, so it stays out of your way while it works.
http://www.eusing.com/Download/AWMSetup.exe - 650Kb - Download - Screenshot

Captain Tray Pro
Captain Tray Pro is a simple and effective tool for windows management under Windows OS. Easy and intuitive windows management Moving windows to system tray Hiding windows Password protection Changing icon and window captions Window ? alarm clock? System Tray icon animation feature (like in ICQ)... Some applications can be minimized to the system tray (the area by the clock in the bottom right corner of the screen), but what shall we do about 'Notepad', 'Calculator', 'Microsoft Word', 'Microsoft Excel', and other our favorite programs?
http://www.softcns.com/downloads/utilities/captain.exe - 1Mb - Download - Screenshot

XNeat
Taskbar, Titlebar AND System Tray Utility that Extends Windows' features. XNeat adds more functionality to windows by adding extra buttons beside the default Windows Titlebar buttons (Min, Max, Close) 1) TaskBar Utility ( Manager - Sorter - Arranger ) : allows you to order ( sort ) taskbar's... 3) Send To Tray: When any window is selected to be Sent To Tray it will disappear and new icon is added in your system tray (beside windows system clock) Some Applications provide this feature like MSN Messenger..
http://www.xneat.com/download/XNSetup.exe - 245Kb - Download - Screenshot

Taskbar Hide - hide windows program
With Taskbar Hide you can fully control the taskbar. As a hide windows tool,it could hide windows program (hide applications,hide program) completely through a hotkey,also you can minimize them to the system tray instead of an icon on your taskbar. You also can change the icon and title of any... Hide any of following:taskbar,start button,task window,system tray, and time clock. ... Show window property of application,such as window handle,class name,process id etc. ... Hide some of the less used icons from the system tray.
http://www.eusing.com/Download/THSetup.exe - 747Kb - Download - Screenshot

Transparent Window Manager
This software helps you to manage your windows settings. You may set transparency of any window required. You may place any window to the top of others. Moreover you may disable input for any window. This gives you opportunity to productive work with graphical and other programs using small and... The windows list allows to you set flags to the windows (stay on top, stay on bottom, disable input, system tray, auto shrink) - Selected window highlighting! ... - Any window in the 'System Tray'! ... Any window can be visible on the active desktop, so window can't be hidden.
http://www.oreware.com/download/TransparentWindowManagerSetup.exe - 2Mb - Download - Screenshot

SD WinHider
SD WinHider is the utility to quickly hide/restore your windows, as well as hide and restore system tray icons. Make your desktop space free for more programs! Features: * Hides/restores any window on your desktop; * Hides/restores system tray icons (like ICQ, AOL etc. ... You may use Alt+Up/Down arrows to show/hide application window; * Fast window hide (by pressing both left and right mouse buttons on window); you can turn this off in setup; * Can start with windows; * You can show/hide windows/icons just by 'turning on/off' them in interface; * You can activate manus for icons just by...
http://www2.sysdevsoftware.com/download/winhider.exe - 406Kb - Download - Screenshot

4t Tray Minimizer Free
4t Tray Minimizer lets you running applications minimized as System Tray icons, which helps in adjusting free space on your taskbar. To minimize any application to the task bar, simply left click the minimize button as usual or press keyboard shortcut. ... Desktop Enhancements: - Hides system tray icons - Launches Desktop programs from the system tray - 'Minimize to tray' and 'Hide window' buttons on the titlebar of any window - 'Minimize to tray' and 'Hide window' items in the system menu of any window Minimizing to tray: -Minimizes to tray any application.
http://www.4t-niagara.com/4t-min.zip - 613Kb - Download - Screenshot

Simple System Tray IMAP Client
This program includes a few interesting and useful technologies i. e. - A Simple System Tray IMAP Mail Client (not available so far) - System Tray Implementation in Visual C#. Net This includes source code, so you could use it as it is or play around with the code to satisfy your requirements. ... You should find the "My" icon in the System Tray. ... First one is the System Tray IMAP Client - It is very useful because I don't have to keep the Mail program open in the taskbar, there being no way to tell if there is new mail otherwise.
http://www7.brinkster.com/arundale/My/My01.zip - 37Kb - Download - Screenshot

PS Tray Factory
PS Tray Factory is a powerful and handy tool meant to flexibly control ALL the other icons in the system tray of the taskbar. PS Tray Factory will help you to manage all the applications that place their icons in the taskbar tray. When you have installed PS Tray Factory, you will forget about... PS Tray Factory allows you to: hide low-activity icons from a system tray into menu, get fast access to hidden icons, change the order of icons in the menu, change the order of icons in the system tray (sort tray), hide from the menu seldom used icons, protect tray menu with password, minimize...
http://www.pssoftlab.com/download/pstrayf.zip - 842Kb - Download - Screenshot