I will probably not be able to adequately put into words what I'm getting at, but I'll try. A suspended note when used properly adds its own kind of depth to the music: the sweetness of the harmony when the surrounding chord structure fits the note, and the tension of an out-of-place note when the surrounding chords do not fit with that note. The given note remains the same, but its color changes as the chords around it change.
In this song, listen for the distorted guitar in the background that holds the same note throughout almost the entire song. I believe the song is in the key of A, and the note we're listening for is an E, the fifth of the scale (or a "So") in this key.