CERT has a nice paper about security. It's for not very technical user. Describes the technical terms in an easy way and shows ways to secure your machine better.
The bad points... Two: it's too long - I don't think that many people will read the whole of it. Second thing: very Windows-related. It says that you need an anti virus, but doesn't say that there are OSes (Linux, MacOS) when such program is not needed.