I just saw Sigur Rós mentioned in the Finnish thread. I used to visit last.fm pretty frequently which is how I've heard of Eluvium, but I've never listened to any of the man's music. I like Sigur Rós well enough, but they're like Animal Collective in that I heard about them, listened to an album (Takk for Sigur Rós, Merriweather Post Pavilion for Animal Collective) and really loved what I heard and then tried going through their other stuff and was completely turned off.
Eluvium is a mix of ambient, shoegazing, and piano music depending on which album you listen to. If you like any of that type of music I would highly recommend them.
Takk is a great album by Sigur Rós. My personal favorite of theirs is Ágætis byrjun.