For a friend who wanted to download all the titles from The Baen online library without doing it by hand, I prodded at the source to their pages, and came up with some incantations to make it easy. I provide them here for your usage.
wget -r -np -l 1 http://www.baen.com/library/titles.htm cd www.baen.com/library cat *.htm | grep option | grep value | cut -d\" -f2 | grep http | xargs -n1 wget
Note that the prefix of a file determines what type it is.
if anyone is wondering it takes about 2 hours to download and you get about 205 megs of stuff, a bunch (70) of the zip files are duplicates, and you get 77 books