Back in September I had the pleasure of contributing to AdMonsters.com. If you’re unfamiliar with AdMonsters, and also a publisher, you should correct that ASAP. It’s an amazing resource and their events are amongst the best (and certainly most affordable) in the industry.
The article touches on how sometimes more ads on a page don’t equate to more revenue and explores some ways to measure the impact of new placements. If you’re interested in checking it out, you can read the full post here.