For some free DSD samples also try bluecoastrecords.com (signup required). The california audio shows from 2011 and 2012 are already full album samplers from their artists.
http://www.bluecoastrecords.com/free-downloadsYou can play DSD/DSF/DFF files through foobar2000 with the SACD input plugin, or download the Audiogate player from Korg. It's free to use with any korg product key, or with a twitter account (it will tweet whenever you use it to convert a DSD track to CD, but for playback no problems).
SACD really has a different sound. It's organic like vinyl, but with the low noise floor and dynamic range of digital.
The aforementioned samples from bluecoastrecords.com are a good example of music that's been recorded and mastered for SACD from the start.