The website has been mentioned by Sean in APAM, but is deserving of finding a home in the links section too.
www.cumberoona.com.au
The site is now being updated daily.
Recent expansion includes a photo and drawing of the original Cumberoona, and a section of coming special events: twilight and evening dinner cruises, covering a longer stretch of the river.

Regards,
Roderick B Smith
Rail News Victoria Editor

I've added it to the links page Roderick, thanks!