I set up an unblock-us account, but couldn't get it to work with Netflix at all on my ATV2.
I set up my DD-WRT router as a repeater (I can't use ethernet) and I connect to the internet fine and if I connect my laptop to the DD-WRT router via an ethernet cable, it works. When I try to connect to the router wirelessly, I can get to the internet, but lose the ability to watch Hulu, Netflix US, etc.
For the ATV2, no matter what I tried it would not connect to the US Netflix. I changed the location to US in the settings, tried it wired and wirelessly to the DD-WRT router, and then tried to just input the DNS straight into the ATV2. Nothing worked.