flickr downloader - get flickr photos back on your computer

It is easy to upload photos to www.flickr.com, but how do you get your photos back onto your computer if, for example, your hard drive crashes or you accidentally deleted your photos? Doing it manually is not an option if a large number of photos are involved. So I wrote a little web application that will automatically download photos from flickr to your computer. It requires your browser support Java Applets, so Microsoft Internet Explorer may not work well, but Firefox and other well behaving browsers should be ok.