I have about 6 books that I consider my "GO TO" books. Then I have 3 or 4 more books that I use for inspiration.
As for magazines - I started taking the articles or projects out of the magazines by scanning them into PDFs. I have the PDFs categorized like "Quilts", "Hints", "How Tos" and then I make the name explain the PDF. Then I donate the magazines. It cut down a lot on the space I needed to maintain them! PLUS it is easier to find what I want.