I put a masthead wind indicator on mine and if it's pretty light I will sometimes look at it for reference. Typically though, some streamers tied to the spinnaker pole bridle wires is plenty of information.
We don't bother because it is always windy in OZ <img src="http://www.catsailor.com/forums/images/graemlins/wink.gif" alt="" />
See you at the 07 Worlds
