This is pretty cool. CashMusic has created a couple of open source tools to promote your new release. We are using them as part of the campaign for The Cult's "Capsule" release.
Fans who Tweet from THIS page about The Cult get a free download of their classic hit, LOVE REMOVAL MACHINE that Aderra recorded last year on the LOVE LIVE tour. In addition any fan that convinces 25 friends to Tweet gets a free, unreleased full concert recording of The Cult.
You can try it yourself at http://emawias.com/Tweet/