Related Question:
Which windows tweaks do you use and they actually work? [1]
Tell us your favorite Windows 7 tips and tricks.
Here's some I bet you never have heard of:
From The Bumper List of Windows 7 Secrets [2]
And a few more off the top of my head:
What tips and tricks do you have?
Windows 7 Keyboard Shortcuts
Managing Windows
Taskbar
General
Windows Explorer
Thanks to Stefan Koell [1] for the list
[1] http://www.code4ward.net/main/Blog/tabid/70/EntryId/46/Windows-7-Keyboard-Shortcuts.aspxAs well as Windows Explorer featuring a 'New folder' button, you can also use 'Ctrl+Shift+N'.
Shake a window really fast (i mean really fast) to minimize all other windows.
Win + T puts focus on the Taskbar. (Then use arrow keys to pick from your pinned apps.)
Drag a window to the top, left, or right of the screen, and have it maximize to the entire screen (top), left half of the screen (left), or right half of the screen (right).
Double-click the top edge of a window (or drag the top edge to the top of the screen) to maximize it vertically without changing the width (great for web browsers).
The window can then be moved horizontally by the title bar without it moving vertically.
Win+Home to minimize all windows apart from the active window. Press Win+Home again to restore the other windows.
Win+Arrow Keys to maximize, restore, minimize and to size/position the window to take up the left or right half of the screen.
Also, I love being able to maximize and restore windows by simply dragging them to and from the top of the screen. This is particularly useful when moving a maximized window from one monitor to another (in a dual monitor setup). You simple drag it from the top of one screen to the other and like magic it's still maximized but now on the other monitor.
Win+space to take a glimpse at your desktop.
Win+m to minimise all windows.
Win+T to go through all open windows on your taskbar (like Alt+Tab but not)
I could reel them all off, and look clever, but here is my source: http://www.howtogeek.com/?p=1523
And they have pictures!
Virtual PC [1] has good integration with Windows 7 -- its Windows XP mode is good for things that just refuse to run on 64-bit Windows or don't work well with UAC.
[1] http://www.microsoft.com/windows/virtual-pc/Launch another instance of an application by Middle Clicking on its icon in the Taskbar. Or, you can Right-Click and select the application name to launch a new instance.
Win+G doesn't just show Desktop Gadgets like Win+Space does, it puts focus on a gadget and cycles as you press it again and again. This is analogous to Win+Space behavior in Vista, and is very useful when you need to interact with your gadgets and not just look at them.
Win + Number Keys to Run an application from the Taskbar. You just press the number that corresponds to the application icon in the Taskbar according to the order they appear. The first one is 1.
Say the first Icon in the Taskbar is Internet Explorer, you just press Win + 1 and it opens up Internet Explorer. If an instance of the application is already running, then it just switches to that application just the same as if you pressed Alt+Tab or clicked on it.
When using Remote Desktop (connecting to a Windows 7 machine), using Dual Monitors (with the Remote Desktop /span command) if you use the Win+Left and Right Arrow the window maximizes to the screen not the entire desktop (which the Maximize button does). Fairly edge case, but I have been trying things like splitview [1] to get this working (which does, except with the occasional crash and the $40 price tag).
[1] http://www.splitview.com/