For two years some people from f.ds have participated in an Armchair Treasure Hunt around Christmas.
The idea is the following: A treasure box is hidden somewhere and then an elaborate puzzle is released, solving which will tell you where the box is hidden. It's really fun trying to find the solution.
Here you can find a teaser for this year's hunt:
http://pablosath.com/current/index.htmlAs you can see, there's already a lot going on there, and the main puzzle document will probably have like 10 pages in that manner. So if you're interested in participating as well, PM Galzria to get access to our hidden forum where we try to solve the puzzle.
It would be especially cool if we could get some English people in, since the treasure box is usually hidden somewhere in England, and since Ozle has disappeared we currently don't have anyone who will actually be able to dig it up. (However, finding out where it would be is quite rewarding on it's own).