Possible Duplicate:
Make my IP address appear to be from another country
I'm outside of the USA. How can I connect to the Internet using my country's Internet servers but be recognized as a USA user?
Possible Duplicate:
Make my IP address appear to be from another country
I'm outside of the USA. How can I connect to the Internet using my country's Internet servers but be recognized as a USA user?
If you want to knockout website based blocks you can use
https://www.sslunblock.com/ (well, timeout...)
or use the Firefox plugin "Modify Headers" to set your "X-Forwarded-For" header to an us ip adress.

But this is only for websites, if you wan't other web services to work you need some us Proxy or VPN service.