My wife and I make a good living blogging -- we have, and are always developing, niche sites that take about a month to build into something substantial, so rou

My wife and I make a good living blogging -- we have, and are always developing, niche sites that take about a month to build into something substantial, so roughly each month there is a new property which we can track for hits and revenue. What works we do more of, what doesn't hit we either revisit strategically (for example acquiring a competitor's site for their google rank), or we just let languish in favor of the more valuable properties.