For those of us who love going analog to digital and back again, the NYPL has made all of their out-of-copyright materials from their NYPL Digital Collections available for download. The Collections are impressive and inspiring with endlessly browsable vintage photography, drawings and other artwork, diagrams and maps. While you're at it you can check out NYPL Labs for great projects like Community Oral History Project and "one of the largest culinary archives in the world" featuring menus from as far back as the 1850s.

Photo above is Libby Durgin, 7th Avenue by Walter Silver.