Apple offers now also an U2 iPod in its latest iPod generation.

The Apple iPod U2 Special Edition comes with a 30GB hard-drive, red Apple Click Wheel and the U2 signatures engraved on the back side - nothing new there.
When you purchase the U2 iPod you get also an iTunes Music Store coupon, which you can redeem for a 30 minute video of music videos and band interviews.

The U2 iPod sells for $329.00. That is $30 more than a standard 30GB iPod.
More details on the Apple U2 iPod page and in this press-release.

The original U2 iPod was introduced in October 2004.