Here’s a helpful article on how long your novel should be, along with enouraging suggestions: http://www.indiesunlimited.com/2012/05/06/is-it-long-enough-said-the-vicar-to-the-nun-part-1-by-chris-james/#more-14792
And a fascinating article covering Mark Coker’s talk about ebook statistics and earnings at Smashwords: http://www.rtbookreviews.com/rt-daily-blog/smashwords-founder-mark-coker-shares-secrets-self-publishing-success
