I go to the library regularly because I have a toddler, and libraries are awesome places that have story-time, indoor children's areas, and shelf after shelf of relatively sturdy board books. But after my daughter gets chance to play with books and puzzles and things, I take a few moments to check out the main part of the library. It's wonderful. There are tons of books, CDs, audiobooks, and plenty of quiet spaces to read or write. And unlike bookstores, all these things are FREE to check out.
Most libraries have computers available which you can use to write on if you don't want to haul around your laptop, and WiFi if you prefer using your own computer. They have printers you can use for a small fee, which is a lifesaver to those of us with cranky printers we forever forget to fill with ink.
Since I've started going to the library regularly, I find myself reading more, and choosing "riskier" books or CDs, instead sticking with what's familiar. I think that helps to broaden my reading habits and improves my writing. And if you're like me, being around tons of books has a soothing, calming magic that's all its own. The library feels like a sanctuary--a quiet, gentle space that's welcoming to everyone, no matter what your financial situation. So like Hermione, go to the library!