This free eBook walks you through the process of knitting socks top-down. For ease-of-reading, the book has been laid out in landscape, giving you a wider (and thus larger-font-sized) view of the text.
Links in the eBook are live, giving you access to tutorials and more. We are on version 5 of this as folks have sent in new/different/better links and such. Check your version number to be certain you have the latest.
There is a companion book on toe-up sock knitting.