I've been listening to múm recently, yet another cool experimental band from Iceland. Their music is a liitle more abstract compared to Sigur Ros, but equally brilliant. "Summer Make Good" is a great album, I recommend "Weeping Rock, Rock" from this album.
I found out that another album I like a lot, "Fold Your Hands Child, You Walk Like a Peasant" by Belle and Sebastian, has something in common with Múm.
The twins on the cover of this album are actually original members of Múm, Gyða and Kristín Valtýsdóttir. "I Fought in a War" is the best song from this album by the way.