If you love direct response analytics, as all successful subscription site publishers should, Kevin Hillstrom, a former circulation and database marketing director for brands such as Nordstrom, Eddie Bauer and Lands End, is the go-to-god.He's released data on how his own ebook sales are doing on Kindle, accompanied by analysis of course. Some lessons he learned:

Price point and page count don't seem to affect sales much, as long as they're "reasonable". What matters, far more, is topic. And, ev...