Mandolin, the digital fan engagement platform, launched two new products today with the aim of assisting artists with turning fans into superfans and maximizing revenue. Fan Navigator helps artists co
<img src="https://techcrunch.com/wp-content/uploads/2011/06/screen-shot-2011-06-20-at-4-37-16-am.png" /><a href="http://vibedeck.com/">VibeDeck</a>, a web service that enables music artists to sell th