The SCP Foundation.

[cliffr]

scp-wiki.wikidot.com/

This wiki is the catalog of the dangerous paranormal specimens kept by a foundation with more disposable personnel than UNIT and more morally questionable practices than Torchwood. Every single article is an adventure seed waiting to happen. Enjoy but be warned, the Wikipedia/TV Tropes effect is strong here - once you go in you will spend HOURS browsing.

Also, some of the articles are high-octane nightmare fuel.

[da professor]

Yeah, I just hope my players haven't seen the bits I'm going to ste...er...adapt.

[Catsmate]

It's a wonderful site, though almost as addictive as TV Tropes. Many useful oddities that could be dropped into a Who game, especially a UNIT/Torchwood campaign set on Earth.

Currently I'm reading the log of a multi week expedition into a sack of potatoes. Fascinating.