On Court Coaching In '07 ?

Could someone bring me up to speed on the on-court coaching situation?
If memory serves, it was allowed at some events in '06.
It was an experiment - right?
Will it be allowed at some or all events in '07?

Thanks.

i heard continued experiments in 07, but i don't know if the commentators are skewing it or what, but it sounds like neither the commentators nor the majority of players like it... neither do i so i hope the idea gets shelved