If you live in Seattle city limits, chances are there's a Seattle Public Library branch within a mile or two of your house. Do yourself a favor and check it out -- the public library here is really outstanding.
There's been a library building and renovation boom, and many local libraries are in brand new or newly refurbished spaces, with comfortable chairs, computer terminals and beautiful spaces. Free wi-fi is in most or all of them.
Although local branches have limited selections, you can "hold" anything in the system (books, CDs, DVDs, tapes) and have it delivered to your local branch. Convenient, though there can be a bit of a wait on new or popular materials.
Of the places I've lived, SPL is one of the best library systems I've seen.