wow well spotted about the Slane DVD! I have it myself and I had not noticed. This flies against all the interviews I have read (at most they say "we have tried everything but always go back to the sm 58"- and everybody says he sings live in the control room). But it does look as that is the final vocal session for Pride, so I think you are right
Still it does seem reasonable that Bono has used
sure sm 58s in the studio more often than no. I've done a quick internet search, but I think there is more out there (Zooropa pictures with him sitting on a couch). However, I have to say instances of him not using an sm 58 would also be interesting, I'll look again at the "making of the unforgettable fire". This is what I found:
Flood on recording POP
http://www.soundonsound.com/sos/1997_articles/jul97/flood_u2.html
Robbie Adams on recording Achtung Baby and Zooropa
http://www.soundonsound.com/sos/1994_articles/mar94/u2robbieadams.html
http://www.findarticles.com/p/articles/mi_m0HEO/is_6_29/ai_n13789680 (though this one applies to the last tour)
Recording single versions of POP songs in the middle of Pop Mart <http://www.signaturesound.com/html/u2atsignaturesound.html>
Brian Eno on recording Bono's voice
<http://music.hyperreal.org/artists/brian_eno/interviews/garageb.htm>
On recording using a sh 57 (sm 57, rather?) on bono's voice in the War era
<http://www.users.globalnet.co.uk/~flare/u2info7.html>
Lanois on recording Bono using a sm 58 again <http://www.neuhouse.com/acadie/interview_2004.htm>
Picture Recording Achtung Baby at Dog Town studios with Lanois (a rented house where they recorded the bulk of AB)
<http://www.u2exit.com/pix/band/band_71>
Pictures Recording ATYCLB at Hannover Quay Studios (at the bottom there's 2 or 3 where Bono certainly seems to be recording in the control room with a handheld mike)
<http://www.macphisto.net/theband/webcam/archiv.html>
I think Lanois says it best in his 2004 interview. Stage mics are a good solution to recording vocals for Bono as he likes to record in the control room listening to the monitors. It's not the most hi-fi solution, but it promotes the kind of atmosphere and performance Bono likes. So lo-fi solutions might be the most practical sometimes.
Of course if people are going to think "bono uses an sm58, it must sound a lot better than a Neumann large capsule condenser" they'd be wrong!!
Cheers,
Santiago