Is there a definitive reference for Windows shortcuts keys?

Question

Is there a definitive reference of all of the Windows shortcut keys along with which operating systems they apply to?

For example, we all know about Ctrl + Alt + Delete, but I've met quite a few people that don't know about Windows + L to lock the computer in Windows XP and up.

Answer 1

I doubt there's a full one anywhere, since programs can make up their own, but this Microsoft one is pretty good.

Answer 2

Here's a rather long list from the Microsoft support website for Windows XP.

Answer 3

Here's the link to Microsoft's own reference. It looks like they're all there.

http://support.microsoft.com/kb/126449