found a brilliant easy way of changing the Netflix content from the UK to the US. Though you do need to be using a Router.
Loads more content and full seasons of TV shows like 24, Lost, Desperate Housewives and so on.
So, just go to 'Network Settings' on your PS3.
Internet Connection Settings
Scroll all the way to the right until you get to DNS settings.
Change the Primary DNS to 126.96.36.199
Change the Secondry DNS to 188.8.131.52
Accept the settings and keep scrolling to the right again until it's all complete.
Reboot the PS3 - this is important as nothing will change unless you do this.
Then load up Netflix and away you go with more interesting content!