Sonos now supports Amazon Cloud Player (Bellissimo!)

Why the big deal? It means you can stream tracks without the need for a server or host PC.

Hands-On ‘Songza’: New curated music service takes on Pandora, Spotify

Songza, I discovered, is a startup in New York City whose staff includes software engineers, and music experts... and what any self-respecting startup also considers core to the business: "absurdly talented dancers."

Amazon to add Sonos, Roku support to Cloud Player

Sonos users, rejoice. Soon you'll be able to stream your personal music files via the cloud, instead of from a local hard drive.

Let the Android Music Play: Spotify vs. Pandora

Just take me to Echo & The Bunnymen for a moody drive on a foggy SF evening; or maybe some incredible Janelle Monáe when highway 101 is at (another) standstill.
for PC or Mac - Review

Sonos, now even better

The new look is a winner. Soft blues and quiet greys provide a pleasing aurora. Everything is right where you'd expect it to be.
Sonos U2

Hands-On: Sonos system software 3.6 update

I gave the new Slacker service a spin. It's now included free as part of the 3.6 update. In a word it's great.
Sonos Play:5

First Look: Sonos Play:5 wireless music system

I'll cut right to the chase, and suggest that probably everything you've read about Sonos is true. They have positioned themselves, amidst stiff competition from Apple TV, Roku, and others as a go-to platform when you're serious about music.