The UNxxB6000 is the entry level LED, and doesn't have the Internet@TV or Widget functionality.

The 7100 - which I believe is exclusive to one retailer - has the Internet@TV and the DLNA as well as the 2GB of storage for the Content Library and downloads.

If you're interested in functionality in the TV, the Internet@TV is a neat idea, and you can check out some of the options available with that feature here:

Does that help?

The new UNxxCxxxx Series has the new Samsung Apps and that includes Netflix and some new widgets that aren't available for the 2009 models.