Art: Photographer Marc Silber will give you Focus on Beauty, a free e-book of his work if you subscribe to his newsletter here.
Books, Graphic Novels and More: Wowio.com calls itself "the only source where readers can legally download high-quality copyrighted ebooks from leading publishers for free. Readers have access to a wide range of offerings, including works of classic literature, college textbooks, comic books, and popular fiction and non-fiction titles." (Registration required; evidently sponsors pay to put ads in the books and the author gets a cut, which pays for everything, although they're a little fuzzy on the details.)
Books, Special Format: ManyBooks.net has 20,978 free eBooks available here, all formatted for reading on your PDA, iPod or eBook reader (small donation requested but not required, looks like all you have to do is register.)
Books, Adobe .pdf Format: Adobe has started a free-to-download eBook library here; to read them, you have to be running version Adobe Acrobat Reader 4.05 or later.
Music: Enter your e-mail (not to be used for spam), and Nine Inch Nails will send you a free EP with "five high quality, DRM-free, fully-tagged MP3 files from a place to bury strangers, does it offend you, yeah?, crystal castles, deerhunter, and nine inch nails. Your download will also include cover art and a pack of digital extras."
Nonfic: Author Jenna Glatzer and publishing attorney Daniel Steven are offering a free e-book version of their nonfic book, The Street-Smart Writer: Self-Defense Against Sharks and Scams in the Writing World for anyone to download; see details here on Jenna's blog.
Print Book: You can get a free print copy of The Holy Spirit by Billy Graham by simply filling in the form at the link; while supplies last, allow 6 to 8 weeks for delivery. Rev. Graham's ministry also offers a new, free inspy print book each month at the site, so check back for other titles.
Recipes: Sign up here to receive a free copy of "your Best of Cooking Light Supper Clubs™, Volume III mini-magazine and monthly Supper Club Dish e-newsletters from Executive Chef Billy Strynkowski. The mini-magazine and e-newsletters include seasonal menus, wine-pairing options, clever shortcuts, and entertaining tips all to help you host your best Supper Club party yet! Note: Mini-magazines will be mailed out in August 2008."