Thanks to LargeHeartedBoy’s Twitter feed, check out several free MP3 samplers which are live right now via Amazon.  Some very interesting stuff on here, so take a look and download away!

2009 Bar/None Record Sampler
Secretly Canadian 2008/2009 Sampler
Sub Pop Amazon Sampler (some big names on this one)
Dead Oceans 2008/2009 Sampler