Before & After magazine offers free downloadable PDFs. Available now are "Design a Logo of Letters," "How to Cool a Hot Photo," and "What's the Right Typeface for Text?"
A PC World article, "101 Fantastic Freebies," lists links to services and downloads in such categories as productivity, file sharing and storage, security, communication, and more.
To see how your book cover designs compare with those of other
publishers, you can check the cover images of books displayed at an
online or local bookstore. To see the reaction of prospective readers,
you can poll your friends, arrange a focus group... or submit your
cover to Rate My Book Cover,
a web site that encourages visitors to give book covers scores from one
to ten. Unfortunately, the site does not allow for comments.