I am releasing a beta version of a USTVnow plugin. You will need to provide your username/password before you can play any streams.
Download from Github
https://github.com/jwdempsey/USTVnow.bundle
Updates
07/14/2014
I will no longer be maintaining this plugin going forward. It still functions correctly however free accounts will stop working after 45 days. You will either need to sign up for a new free account or use a paid account.