Before&After is a print and online magazine that is full of honest-to-goodness tips for the layperson on building better design. Started in 1990, this site (and publication) helps put real world design tools into the hands of people who may have to design without ever been given the training like real estate agents and small business owners.
Individual articles are sold for $5 each and a subscription for PDFs is $24 for 32 articles. A print edition of the publication is also available as well as books. Each article is around 20 pages and many look like tips and tricks that might even help a seasoned designer rethink their approach to a design problem.