Image Downloader is the first full-fledged download managed for Windows Phone 7. The concept is similar to desktop PC applications like “Flash Get”, “Down them all”, “Download Accelerator”, etc. WP7 version is dedicated to images and will allow you to download all images from any web page or a gallery and save to your phone Pictures Hub. Features include support for both embedded and linked images, recursive website crowling , up to 5 concurrent background downloads (using new mango feature called background transfers), web browser impersonation, etc.
This is perfect for photo websites like flickr, various image boards, personal blogs like livejournal, etc. Because one video speaks a thousand words (and many do quite literally) I recommend you to view this video that demos all main features of the app.
Image Downloader is completely free AD-supported version.
Image Downloader PRO is only 99c, has fully functional trial, additional settings and no adds in paid version.