I just heard about a new article called "Soundtracks of Acrobatic Selves: Fan-Site Religion in the Reception and Use of the Music of U2," which appears in the October 2011 issue of The Journal of Contemporary Religion. Free viewing of the actual text isn't possible for 12 more months (even from within an academic gateway with a subscription, it seems), but the abstract says that the article analyses 40 pieces posted on a fansite in response to U2 songs, looking at how such online reflection "may contribute to the development of religious/spiritual exploration in contemporary Western societies." The authors are Clive Marsh and Vaughan S. Roberts.