Interesting idea, but what airlines does this support? Looking at eg. MEL-LHR, I'm only getting prices from United and Royal Brunei. No sign of the major players on the route: Qantas, Emirates, British Airways, Singapore Airlines, Qatar, Etihad. Are they not showing up because they're too expensive, or because their data is not available?
And the thing you'd need to convert this from "neat" to "awesome" is an availability check of the fare and a "Book this now" button.