Hi gaztin657,
I haven't heard of a case number? you get a File reference number, but when you get a file number that does not mean you have a case officer. You get issued with your file number when you get your full acknowledgment letter.
Yes you can go onto
Department of Immigration and Citizenship and track your application but I think you can only do this when you have applied for your visa application on line.
When was your application lodged, are you using an agent or doing it alone?
You can call the Adelaide processing centre (00611300364613), if you give them your file number they will be able to give you an update. Although we are using an agent I'm starting to get really fed up with all this waiting and not hearing anything, so i called them last night and they were really helpful and gave me the update I was waiting for.