The Most Important Video Game Ever?
Here's Seth Schiesel reviewing The Beatles: Rock Band in this weekend's New York Times:

The Beatles: Rock Band is nothing less than a cultural watershed, one that may prove only slightly less influential than the band’s famous appearance on “The Ed Sullivan Show” in 1964. By reinterpreting an essential symbol of one generation in the medium and technology of another, The Beatles: Rock Band provides a transformative entertainment experience.

In that sense it may be the most important video game yet made.
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With all due respect to Wii Sports, no video game has ever brought more parents together with their teenage and adult children than The Beatles: Rock Band likely will in the months and years to come.
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Previous music games have been about collections of songs. The Beatles: Rock Band is about representing and reoffering an entire worldview encapsulated in music.

An entire worldview?