Pirates of the Amazon was a potentially useful hack: a Greasemonkey script, packaged as a Firefox extension, that searched thepiratebay.org in the background (the clever bit - there were lots of scripts for adding search links already) and added links from Amazon items to The Pirate Bay torrent files.
As an art project it was immensely successful; as a useful tool less so, because of the trademark infringement, incitement to copyright infringement and horrible javascript :-)
Here's a rewritten Greasemonkey script that recreates the functionality of Pirates of the Amazon, without any of the bad bits:
→POTAtoo←