I'm interested in people's thoughts on this - where does freedom of speech end and how much should it be tempered by respect for others?
It should be tempered exactly to the extent that those running the website choose to temper it.
Wikipedia has no obligation to kowtow to the wishes, reasonable or not, of any particular religious group. If muslims don't like the depiction of Muhammad, they shouldn't go to Wikipedia.
Those who would sacrifice an essential liberty for a temporary security will lose both, and deserve neither. -- Benjamin Franklin
We see monsters where science shows us windmills. -- Phat