At Apple's event today, U2 reveled that they are releasing their album for free to iTunes members. Songs of Innocence features the single The Miracle (of Joey Ramone) and guest artists such as Lykke Li.
UK's Telegraph has this to say about the album: "[...] I wouldn’t put it on a par with their greatest work - Boy, Joshua Tree, Achtung Baby or even the seamless songs of All That You Can’t Leave Behind. At times it does sound like it is trying a bit too hard to please. But it's more pop than Pop ever was, and it certainly does the job it apparently sets out to do [...]"