To all the U.S. peeps out there who've been waiting on Spotify, the Swedish music streaming site, you'll be happy to know it's launching tomorrow. More importantly, if you sign up now you can get an invite as soon as it goes live (guess they're doing the Google model of things with invites, blarg).

Sure, we don't yet have an official Spotify app for Windows Phone, but there are third party apps in the Marketplace. More importantly, there is an official app coming, as demonstrated at MIX11 a few months back. The "Mango" version will of course allow your music to stream in the background, much like Zune player does currently.

Our big question though: Could we see a non-Mango version launch in the next few days? Seems like something Microsoft would do, what with that marquee app blitz they did a few weeks ago. Plus we've seen some non-Mango versions of apps like Best Buy and British Airways released, even though they were first demoed with Mango features. Hmm...

Head here for the signup!