WebGrabber, from the author of Fire, is a free utility that you can use to mirror, copy, synchronize, download, scrub or "steal" a web site. WebGrabber is a simple wrapper around the "Pavuk" project (see http://www.idata.sk/~ondrej/pavuk/), a web grabber/spider. This UI is very "unfinished," and not all Pavuk command line options are yet supported, but the author has wrapped the most useful and most common options first, and is willing to add more. WebGrabber can be used to download entire web sites, download an entire directory of images without being able to see them, and for ftp downloads; it'll even split downloads across sessions and resume them. Version 0.7 changes the download directory to be ~/Desktop instead of /tmp.
"WebDevil might work a bit better, but WebGrabber has two things going for it: it's free and the source is available. Very stable, you can feel the UNIX behind it. Downloads other media types, Flash, etc."
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These are applications that are newer and of potential interest, but which I haven't yet selected for permanent inclusion. Have a look, and let me know if you think they deserve to be part of the permanent collection!