Auslan to text/Text to Auslan

Tablet smart phone based app so hearing impaired can communicate with the hearing and visa versa. Would be the first of this type of app in the world as far as I know. Motionsavvy . com have been playing with it but never finished and it is for ASL. I have a few deaf friends and was surprised there was nothing like this that worked out there. I envisage it would be a saleable app if there is anyone willing to help....