You might say Penguin has had a rocky relationship with libraries. That looks to be on the tentative mend, as the publisher and 3M have together cut deals with the Brooklyn Public Library and New York Public Library to bring Penguin's e-book catalog back as part of a test program. Under the terms of the one-year project, the libraries will pay retail-level prices once a year to keep any given e-book available, no matter how many times it's virtually borrowed by residents in the b