The folks at LifeHacker have put together a very handy list of all the keyboard shortcuts to make navigating your way around Windows 7 a whole lot faster and easier. Think of it like the Windows 7 bible. If you're able to memerize most of these then all the more power to you with your l33t Windows 7 expertise.
Whilst the video above demonstrates just how convenient the use of these shortcuts can be, the full master list in text form can be obtained via the source link below. It's highly recommended you make note of this!