Officeworks - WDTV Live - now only $98
Absolutely fantastic device - is cheap as they have brought out one which has a built in HDD.
Full HD (1080p), support for most file formats....
I have a 'non-official' firmware update on mine which enables you to view movie sheets (that have the DVD cover, synopsis on the movie, cast, movie length, etc) which I find is much better than having just a big list of movies.
Tempted to buy another one because they are just sooooo cheap!