Paparazzi!: “a small utility for Mac OS X that makes screenshots of webpages.” It’s free. Thank you, Nate Weaver.
Note: pages. Paparazzi! takes a shot of the page, not the screen. It saves one (or me) the tedious labor of stitching screenshots into a larger whole. Unlike Div Shekar’s BrowseShot (also free), Paparazzi! works with Google Books. That’s what makes the app especially useful to me.
Thanks to Zoe Rooney, who recommended Paparazzi! in a blog post.