Less is more, cheaper earn more - http://www.codinghorror.com/blog/2009/08/software-pricing-are-we-doing-it-wrong.html

Don't try to lie - http://www.siriusdecisions.com/blog/whats-the-best-way-to-announce-a-price-increase/

The ability of pricing is the key http://thehousenews.com/finance/%E7%B5%82%E6%A5%B5%E8%AD%B7%E5%9F%8E%E6%B2%B3/