The Sydney Mystery, by once Sydney based Twilight Software, has been released. It's available through web/mail only (at a pretty reasonable price too!) and sales so far have been great! Sydney Mystery contains..
"over 240 scenes, 17 different locations, 11 characters to meet, and lots more exploration, puzzles and clues."
There is a playable demo available as well, which allows you to play Act 1 of the game. You can find all the details at The Sydney Mystery website.