To elaborate a little:
(1) download the usual HTTP/FTP/BitTorrent/ed2k links;
(2) download a whole site or part of it (like those offline
downloaders/readers);
(3) download Flash and videos on a web page (like those Flash video
downloaders);
(4) download a Blogger or WordPress blog as a single ebook file (in
PDF or other formats);
(5) download a Flickr stream or Picasa album or Facebook album as a
single album archive or ebook;
(6) download user-selected Wikipedia articles as a single ebook;
(7) download content from other major user-generated content sites as
a single archive or ebook.