Windows only: Downloadr is a small application that allows you to completely back up the photos from your Flickr account. You can grab everything in one bulk swoop or use a series of filters to drill down to just the photos you want to grab. It automatically grabs the highest quality image and preserves the EXIF and IPTC data. In addition to searching grabbing images from your own account, you can search creative commons works on Flickr and use Downloadr as a tool for bulk grabbing them also. Downloadr is freeware, Windows only.