BeTrayed 

BeTrayed! is a small 32 bit command line utility which allows you to easily add a collection of shortcuts to the System Tray (Notification Area in Microsoft speak) It allows you to quickly access frequently used folders, files, URLs and applications.
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PopScan 

A small, easy to use e-mail checker with spam detection (including heuristical matching), mail preview feature, dial-up support and lots of options. You are notified of new mail through the system tray icon, and your choice of messages and sounds.
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Clever Keyboard Indicator 

Features:* Display "Caps Lock", "Num Lock" and "Scroll Lock" indicators in the windows system tray (next to the Clock)* Allow the user to specify which indicators should be shown/hidden, set the indicators order and give ability to load custom icons.
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DateTray 

DateTray is designed to show todays date and calendar in your system tray. By clicking on the date in the system tray it will display a calendar on your screen and allow you to search forwards and backwards to display any date you require.
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tcpIQ Dictionary 

The tcpIQ Dictionary is a handy, free dictionary which sits in your system tray monitoring clipboard. When you copy a piece of text into the clipboard, the dictionary 'opens up'. It also features a thesaurus.
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SoundWheel 

Sound Wheel is a custom volume control. Press a hot key, and your mouse wheel becomes a volume control. The tray icon indicates the current volume level. Choose your own hot key and wheel sensitivity
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