Superb articles Aaron. One point of interest. Perhaps its just me, but, if your going to do a security article on the dangers of plugins then why not inform people as such rather than ending with this: These are a few dangerous combinations. There are more and I could be even more specific. Maybe another post later on.
I like many people have been using wordpress for nearly four years now. I have a lot of plugins running, namely for spam and security. But, I have to admit, I'm none to comfortable with that situation. On several occasions I have come to the conclusion that there is something amiss on the blog, but I can't quite put my finger on it. Things are not quite as they seem. Maybe its paranoid, then again, maybe something is amiss? Articles, like yours are a necessary tool for people to sit up and take notice of the dangers that are around.
Thanks for the articles and I will be keeping a close eye on your blog from now on as it is good to be informed :)