I'm getting enough from my channel stats that I can see a very definate trend in favor of content/article pages compared to any sort of list of contents or index page. I guess that is encouraging as it looks like people are more interested in following the links to my content than to the ads. Some of my content pages apparently don't trigger anything more specific and are simply bring up the usual general widget and widgeting supplies ads. They do well but the the ones that draw more specific ads related to the subtopic addressed on the page really bring great CTRs. This means to me that if the Google algo could get more specific it would really boost CTR.