$9 a month will get you a hell of a lot of content, dude. Netflix instant streaming is amazing. Even if you remove the TV seasons I have in my Instant Queue, there's over 200 things I've thrown in there :x Totally random stuff that looks neat (like Mongol), classics old films, some newer stuff, documentaries...yeah.
To the OP, I think it was answered, but if you have the Netflix plan and XBL Gold, there is no additional cost. Isn't that amazing?