In firefox install the following addon:

http://addons.mozilla.org/en-US/firefox/addon/967 then:

1) In Firefox, Go to tools->modify headers

2) From the drop down box on the left select add

3) Then enter: "X-Forwarded-For" in the first input box without the quotation marks

4) Enter: "12.13.14.15" in the second input box without the quotation marks

5) Leave the last input box empty, and save the filter, and enable it

should look like this: http://imgur.com/Feb4.png

6) Click the 'Configuration' tab on the right then proceed to check the 'always on' button.

Close the Modify Headers box and it should work.

This will let users outside the US watch shows on some sites like:

http://www.thedailyshow.com
http://moviesblog.mtv.com
http://www.southparkstudios.com/
http://www.nbc.com
http://www.ColbertNation.com
http://www.southparkstudios.com/
http://www.nbc.com

probably some others too I don't know about. Doesn't work on Hulu unfortunately.