About a year ago, Lee Brimelow and I released a simple application named flump that would download all of the images from a flickr account. We made this so we could download all of the webcam images from the bus tour, and put together a time lapsed video (you can view some of that video here).
The original version worked on the beta 1 release of Adobe AIR, and did not work on the release version. I have just uploaded a new version which works on AIR 1.1 and adds a couple of new features and fixes some bugs.
You can find more information on Flump, as well as download the application and its source from its page at:
If you run into any issues, or have any feature requests, just log them here.