Quickly Zoom In and Out of Any Windows 7 Application

Windows: With Aero, Microsoft added a nifty magnifier tool to Windows 7 that enables you to zoom in—regardless of the application—on the fine details on the screen. For faster zooming, here are some keyboard shortcuts.
To quickly zoom in to any part of your screen, hit the Windows key and +. By default, the Magnifier will zoom in 100% increments, but you can change this in the tool settings. Hold down the Windows and - keys at the same time to zoom back out.
Update: as some commenters pointed out, although Vista has the Magnifier tool, the full screen zoom doesn't work the same way as it does for Windows 7.
Other quick keyboard shortcuts, once you have the Magnifier tool up, include:

• CTRL + ALT + L to bring up the lens display view
• CTRL + ALT + D to dock the magnification area.
• CTRL + ALT + F brings you back to the full screen mode.

In some applications, such as your web browser and Photoshop, you can use CTRL + and CTRL - instead to zoom in. But if you ever want to get a closer look at something in Windows 7 and the CTRL + shortcut doesn't do anything for you, try using the Windows key instead of the CTRL key.