Groove is a support software that markets itself for SaaS and eCommerce services. It looks pretty nice, kind of like a Help Scout Plus, maybe. I read a post on their blog about 7 lessons they learned to reach $30,000 of monthly revenue in their first year. It has some pretty great practical tips you may not have thought about for your product or service business, each with stories and numbers behind them. It's definitely worth a read.
The primary things I got from it are that testing beats intuition, nudging customers to do what you want them to do works, and being personal is always the right choice. They also have handy Google Docs linked in the post of some business blogs they follow (including one or two members of the WordPress community) and a blogging checklist for writing and marketing posts.