Not sure what video you're referring to above but you may be interested to know that there is a full length movie, called 'Heima' (which means Home) available on DVD, which documents the band's tour of free gigs around Iceland in the summer of '06. Stunning locations which fit together very well with their sound track. Oh and you'll catch a glimpse of some genuine Icelandic kvæðalög (that´s traditional singing to you and me). More info available at:

http://www.sigur-ros.co.uk/band/disco/heima-dvd.php

Outside of the folk world, over in the alt rock / indie / whatever world, Sigur Rós are a big draw and here in Iceland they are almost a national institution.

Oh and by the way they are 4 very nice, ordinary blokes (I´ve met them and drummers Dad is good friend of mine) their down to earthness also comes across in the film. The B.S. above about the band´s religious inclinations is exactly that, B.S.