Hashdb webinterface
Where?
Why?
I personally use the database from time to time for the odd lookup or maybe during a CTF, but right now there is no compelling reason to not share this resource with others. Perhaps it will finally dissuade some people from using dictionary based passwords and broken hashing functions (Though sha256 is not known to be broken yet.)
Can I access it from my site/program?
See API page for more information.