Please allow yourself 7 uninterrupted minutes and wear good headphones if possible. (If none are available, then crank it up!) When "the Triibe" played in Spain last year, we used this as our opener.
I am continually inspired by this video.
The Sigur Ros official site
Here is a page you can go to and stream a very good quality version of this video (much better quality than the youtube link too). You can choose high quality Quicktime or Windows Media under the "streaming links" heading. Choose the highest and wait for it to load in - it's worth it. While you're there, you can read the Q&A with the cinematographer, it's very interesting.