"Feelings, you, smells, and sounds"
I would have to say one of the harder things about
building is getting players to feel a certain way
without coming out and saying something like, "A
feeling of fear overcomes you." The player
sitting at their computer very well may not be
afraid. A couple of alternatives could be:
"The acrid smell of fear
lingers in the air"
"An eerie wind rustles softly through the leaves."
A couple of good rules of thumb for using 'you':
never use it to start a room description, never use it
more than once in a room, and use it in as few rooms as
possible.
"Finding the balance of using 'you' is
tricky. Some muds disallow the personal pronoun 'you'
at all, although I think that's a bit extreme."
Arachne of Oddville
Some muds have a guideline that states you should
not use smells or sounds either, on the basis of a
"scry" skill, where players can see where
other players or creatures are. I do not agree with
this. Smells and sounds are a good way to add depth to
the game.