Bumping up the Windows Experience Index[Click image to see full-size]
In Vista, this measurement of system performance was capped at 5.9 for each of five measurements. In Windows 7, the top of the scale moves up to 7.9 (check the top two numbers here) and the individual tests are much more intensive.
This gallery is a companion piece for my in-depth review of Windows 7 based on the final release candidate. Be sure to read "What to expect from Windows 7" to get the full story.