I recently had a chat with the developer of the Frugal Theme, Eric Hamm. Today he's become quite successful and his Frugal theme is used by major blogs like Zen Habits, Men with Pens, and even here at BlogcastFM:
Why subscribers and large amounts of comments on posts and lots of readers doesn't equate to revenue
How to earn revenue by selling services
The exact process he went through to develop his own theme
How he developed the Essential Motivation Handbook in Partnership with Leo from Zen Habits
The importance of diversifying income streams
Why you should only be promoting affiliate products that you use
How to collaborate with well known bloggers by building relationships
How posting once a week caused traffic to triple
The Importance of a Marketing Plan for bloggers who want to make money