Wiley has allowed Ross Anderson to release his widely respected book "Security Engineering" online as a free download (server is under heavy load right now).
While this book might be a bit in-depth for the normal computer user, many non-security type people still find it useful. For example, the chapter on Bookkeeping is useful for many small business owners and the rest of the book is full of interesting security insights in all kinds of fields.
Perhaps, you have something interesting to say?