Best way to stream Spotify?

I know some receivers are starting to build this functionality in for P and Spotify, but how do you do it in a normal hifi rig?

I have an AppleTV that I stream music from a server in the office, but there is no Spotify button on the ATV interface (like Netflix, etc). I am buying less and less CD, more and more LPs since MOG/Spotify came out.

Thanks,

KeithR