ember - 8:37 pm on Apr 15, 2013 (gmt 0)
We were using one particular network, and last fall it tanked. Something about suddenly not enough advertisers in our niche, even though we are hardly a small niche. So we switched to a new network and have their in-text ads on a few pages. They earn about 1% of what Adsense earns. I should probably just remove them.