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 Internet Directory - Top : Computers : Software : Desktop Customization : Startup and Shutdown Screens
Top : Computers : Software : Desktop Customization : Startup and Shutdown Screens (3 web sites)
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MetalScreens
Heavy metal startup/wait/shutdown screens for Windows. Also offers desktop themes and screen savers.
http://www.angelfire.com/rock3/megabob6666/

Planet Mainstream
Many start-up logos, with instructions on replacing the Logo.sys file.
http://www.angelfire.com/my/plinth/logos/logos.html