The negative factors are more interesting than the positive ones, and I suspect that the folks who wrote this probably didn’t give away all of their secrets, and didn’t tell us everything that they look for. They may have even provided some of the weaker factors. Nice analysis. Full versus partial RSS feeds? Good question.

Glad you liked my analysis. When I was thinking about the full and partial feeds I couldn’t help but think of Aaron Wall. Aaron publishes a one or two sentence description of what the post is about. According to the patent that would be an indication that SEO Book isn’t a quality blog. I think you’ll agree Aaron has one of the higher quality blogs on seo.

My though about all the factors as with all ranking factors for the general search algorithm is you can never look at any of them in isolation as something that will automatically help or hurt. I think search engines have long since advanced beyond the point where they need to look at any factor alone and would sooner be looking at them in conjunction with other factors. So if you publish too regularly it might only be a problem if you also have very different feed and post content and maybe too many ads. Having any one of the above probably doesn’t change things too much one way or the other.

And like you said Google probably isn’t telling us everything. I suspect they know a little more how we’re all going to react to things than we might think and sometimes give out limited information to manipulate us a little.