These days, not many acts would consider that number a disappointment.

So what caused U2s middling sales?

It wasnt economics; fans could buy it digitally on Amazon.com for the ridiculously low price of $3.99.

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Nor was it due to a lack of promotional savvy.

U2 opened this years Grammy ceremony and took up residence for five consecutive nights onLate Show With David Letterman.

(The appearances did little to gooseLettermans ratings, perhaps indicating lukewarm interest in the album.)

37 on the Billboard Hot 100.

They didnt have a clear radio hit, says Jay Beau Jones, program director of Bostons WBMX-FM.

When I first heard Boots, I thought,Its a good song.

But when I first heard [Coldplays] Viva La Vida, I thought, Wow!

I think the record will have long legs as people get exposed to more and more of the tracks.