Anyone used the group storytelling? I am abit uncomfortable with having my players tell me that a tower is standing over a hill and all. I did implement something similar for Play by Post using Google Wave though, since it's all narrative driven, but not sure if I can open up to that method on the table.
I have recently started using it a bit, so that at times, when a player asks to roll a check pertaining to some knowledge, and I do not have an answer ready, I ask the player to tell the rest of us.
Example:
Player: My character is wondering what kind of relationship there is between the goblin and kobold tribes in the area.
Me: Roll X and Y check DC Z (too lazy to look up what I decided)
Player: (after making the checks): I passed the checks, so, how is the relationship?
Me: You tell me
In this case, the player's decision (that goblins and kobolds have a very poor relationship and only work together when forced by a very powerful figure, such as a dragon) played right into my campaign, since that is what happening. But even if he had said that they absolutely hate each other and would never work together, I could still have made it work, either by creating an exceptional situation or by ruling that they do not know of the other race's involvement in the plot.
I guess my point is that so far, none of the small things I have allowed has caused any headaches, but I can't say that it will never happen.