rating.com.au sticks out because the plural had a 35k offer on Netfleet, although you'd be lucky to get that for the singular.
Owner of the plural is a member here.
I've just emailed him asking why he didn't take the offer!!!!
I also like onlinecredit.com.au and onlineclassroom.com.au. Definitely have potential to me if they were developed. Though some people don't like domains that have "online" in them.