Ctrl+Shift+T in a browser.

If only this worked with Windows Explorer windows!

WinKey+B for system tray access and navigation via the left/right arrows.

Mmm, convenient 

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Recently learned about Ctrl+Shift+L in Eclipse (Help > Key Assist...).

WinKey+B for system tray access and navigation via the left/right arrows.

didnt know that one - very convenient alright

WinKey+B for system tray access and navigation via the left/right arrows.

Man... why not you tell me this earlier...

A handy combination that I had to search like hell to find.  If a program's window disappears from the screen but it is still open - meaning the window has moved to a location off the screen:

Alt-Tab to the missing window, then Alt-Space, M, then any arrow key. Now move your mouse and the missing window will suddenly pop back onto the screen.
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Quote from: dojibear on December 06, 2012, 09:42 PM

I wonder if I can make an Autohotkey macro to do it. Then I wouldn't have to remember it with my brain.

How's this?  Control+Alt+Shift+S to invoke:
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When I've had that happen in the past, I kept an autohotkey script on my desktop that would grab the last active window and center it.  So I would select the hidden program in the taskbar, and hit the script, but I agree a custom hotkey would be better.
Since abandoning Windows, I don't have a copy to reference, but this may do the trick, anyone care to test?

WinActivate ; grabs the [url=http://www.autohotkey.com/docs/LastFoundWindow.htm]Last Found Window[/url]
WinMove, (A_ScreenWidth/2)-(Width/2), (A_ScreenHeight/2)-(Height/2)