I started out just using the onboard flash and a copy of Scott Murray's diffuser, which works very well,
read about it in his thread here, http://nikonites.com/macro/16864-experimenting.html#axzz2jTofAP5h
I now have a Yongnuo YN568EX flash, I am trying different diffusers with it to try and get it to work as I want,
check out some of my efforts here, http://nikonites.com/macro/17507-yongnuo-yn568ex-flash-macro-close-ups.html#axzz2jTofAP5h
read about it in his thread here, http://nikonites.com/macro/16864-experimenting.html#axzz2jTofAP5h
I now have a Yongnuo YN568EX flash, I am trying different diffusers with it to try and get it to work as I want,
check out some of my efforts here, http://nikonites.com/macro/17507-yongnuo-yn568ex-flash-macro-close-ups.html#axzz2jTofAP5h