Windows: If you use a third-party application dock in place of the Windows taskbar, you may have noticed that you can't completely get rid of the taskbar. Taskbar Eliminator helps you turn it off and keep it out of the way.
You can minimise the taskbar in Windows but you can't full-out remove it. This can be a bit of a pain if you're happily using a 3rd-party application dock and you don't like the taskbar popping up or even taking up that tiny sliver of screen real estate to say "I'm here!". Taskbar Eliminator is a single-purpose application that removes the taskbar from the screen and keeps it from popping up or getting in the way, letting you use your 3rd-party dock in peace.
Taskbar Eliminator is freeware, Windows only and works on Windows XP through Windows 7. Have a shell-tweaking application you find useful? Let's hear about it in the comments.