OK, I'll admit right off the bat that this is absolutely nothing to do with Hellboy 2 - but it IS another ARG I've just discovered that has been running for a few months. The story is very dense, but don't be put off as this looks to be another very strong game, with a massive community already going strong. I just took a personality test in-game, and this is the result I got:
If anyone's reading this in London, come to the event on Sunday and I'll see you there!
Also, this is fun (and liable to cause explosions of happiness in anyone who A: plays video games B: grew up in the 80's or C: all of the above):