Microsoft has teamed up with author Linda McCarthy to offer a free downloadable version of her new book Own Your Space – Keep Yourself and Your Stuff Safe Online. The book covers a variety of computer security and online safetly topics and is aimed at internet savvy teens, as well as parents and educators. Personally I'd say that the chances of teens reading it all the way through aren't great, but parents of online offspring should definitely get up to speed with this stuff.
Frankly I'd recommend that anyone who uses the internet and isn't as capable as Sarah Connor at fighting off the machines, should read this.
Both PDF and XPS versions are available at the Microsoft Download Center.