A handy bookmarklet that downloads and stores all images in an Imgur album into a single Zip archive. To use it, just click it while viewing an Imgur album. The individual images will begin downloading in the background, with the progress appearing in the lower-left corner of the screen. Once complete, the progress message will by replaced by a download button. Just click it, choose where to save the Zip archive, and it will be instantly saved. That's it.
Adobe Flash 10 or newer is required. Besides that, you can check browser support here: "Canvas element#Support" on Wikipedia.
tl;dr - You need Flash, no support for IE8 or older.
All processing is performed locally in your webbrowser; no information is sent anywhere. This tool is completely unaffiliated with Imgur and is licensed under the BSD License. Source is available here.
Imgur and the Imgur logo are either trademarks or registered trademarks of Imgur, LLC, and are © 2012 Imgur, LLC. All rights reserved.