[Moderator note: this is the primary thread for the TrayEverything database entry.]
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TrayEverything (currently in v1.03) is a program that allows any running application (except explorer.exe) to to mininimzed to the tray.
http://www.winapizone.net/software/trayeverything/
Extract it using Universal Extractor. The interface is in Italian by default, although it can easily be switched to English.