I've been scouring the net for help with my fussy eater and found a couple of books that have really helped
1. Give Peas a Chance-the foolproof guide to feeding your picky eater by Kate Samela
This one is from the US but is easily adapted to AUS. written by a peadiatric nutrition specialists. It has great ideas on how to add new foods. Love the writing style, easy and plain english.
2.Feeding Fussy Kids by Julie Maree Wood with Antonia Kidman. Some great recipes and ideas on boosting nutrition in the few things they will eat.
I borrow both from the library. I've used some of the ideas and for the past week ds has eaten something at every mealtime and has even tried a few new things too. No miracle cure but a lot better.