As you’ve likely seen reported, the Copyright Royalty Board decided to dramatically increase royalty rates for internet streaming, and changing the way that such royalties are calculated.
This will make it cost-prohibitive for many online steaming stations to continue.
From SaveNetRadio.org:
The future of Internet radio is in immediate danger. Royalty rates for webcasters have been [...]

Another great source of music online is FreeIndie.com - they make available full albums (usually more like an EP length - 5 or 6 songs) from independent artists for download.

They’ve featured, for example:

Beirut
Ted Leo and the Pharmacists
Bright Eyes
Voxtrot
Tim Fite
Rogue Wave

Via Retro Music Snob, I discovered these wonderful posts on Pop Headwound:

Wilco - Rare Tracks, Vol 1.
Wilco - Rare Tracks, Vol 2.

Not only are the tracks great, but PH provides a nice little explication of each track, with source and often links for more info.
These tracks should help hold you over until Sky Blue Sky [...]

[Update - Peter Bjorn and John will be live on NPR Monday, April 30th - often these shows are available for download after the fact if you miss the live show]
Continuing on the Scandinavian theme (Under Byen) are Peter, Bjorn & John, who’ve recently appeared on both Morning Becomes Eclectic and KEXP’s Live Performance podcast [...]

Via High Touch I stumbled upon Irrational Public Radio.

Go listen to the demo - if you’ve ever been a steady listener to NPR, you will find the whole thing very funny.