I bumped into them yesterday when I was browsing Last.fm, seemed pretty sweet.
They are pretty much like every other ambient artists, although their sound is a bit liquid if you know what I mean.
You should check out Brian Eno (if you haven't yet), everything from him is absolutely genius. Michael Stearns' album called Planetary Unfolding is also among my favorites. Then there is Aphex Twin (not everything from him is ambient / relaxing), Moby (most of his stuff is ambient), Mike Oldfield (new age), Enigma (new age) and so on.
Then there are some others from different genres, who play relaxing music. Such as DJ Krush, God Is An Astronaut, Kwoon, Hammock, Sigur Rós, If The Trees Could Talk and Explosions In The Sky. Apart from DJ Krush, who is one of the greatest turntable artists, all of them are more or less instrumental / post-rock bands.