It depends on the product.
Currently, Netflix has updated the interface for some of the 2010 products that allows you to browse by genre, pick recommendations and choose from your existing queue. These require the latest firmware updates for specific models, and may not be rolled out on all models. It's unknown at this time if the App owner will update this functionality for 2009 and previous models.
Curently, you have to log on to your netflix account on your pc and add movies to your que to watch them on your Samsung TV. The Samsung/Netflix interface only allows you to access the movies in your que. On my LG DVD player, the Netflix interface allows you to access anything without having to go to your PC. Frankly, it blows away the Samsung interface.
Is there anything in the works or even possible to change that interface to eliminate the need to use a PC with your TV to view netflix movies? Firmware/software upgrade?