wget -e robots=off -nc -r -np --accept mp3,mobi,jpg http://randomsite.com/directory/nicethings/
This is useful to download all files you are interested in, from a public website, recursively.
-A switch is used to filter the files to download. If you are looking for mp3 files, or mobi files, just change the file extension in the -A switch.
You can try it on the servers published on /r/opendirectories.