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Thanks for the recs so far. If anyone else is interested, here are a few other bits of 8bit I've found over the couple of years...

8 bit versions of Radiohead's Kid A & OK Computer:

http://www.nme.com/blogs/nme-blogs/radiohead-the-8-bit-versions

Interesting chip music, where you buy the chip, power source and headphone jack, all ready in a cd case:

https://www.youtube.com/watch?v=Yh6-X9Vs_vk

If you like the work of Arvo Part, you might like this 8bit version of Fratres:

http://hd1.linusakesson.net/files/Linus Akesson - Fratres (Arvo Paert) - Dual SID.mp3

Various:
http://disasterpeace.com
http://www.nme.com/blogs/nme-blogs/this-charming-mario-nintendo-vs-the-smiths
 
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