Some online dictionaries, like Reverso, accept people's input. It seems to me it works a bit like wikipedia - it started off being rather poor, and it was even a shame in certain milieus to check things there, but, over time and a moderated open collaboration, it's getting better. Maybe never completely reliable, but better. Then again, "official" printed books are not necessarily reliable either. ;-)
Anyway, I'm just curious to know if you spend your extra time voluntarily updating and participating in this kind of dictionaries, or if you think that kind of openness does the world no good. Or something in the middle, of course.