All you need is a Firefox add-on and a few blocked ports.
First, download the Modify Headers add-on for Firefox. Once installed, go to Tools > Modify Headers in Firefox and add a new filter by clicking on the drop-down menu and hitting "add". In the first box, type X-Forwarded-For and in the second box, type in the IP adddress of any US web site. Leave the third box blank, and then save and enable the filter.
Next, block TCP and UDP port 1935. To do so on Mac, all you need to do is type the following in a Terminal window:
sudo ipfw add 0 deny tcp from any to any 1935
sudo ipfw add 0 deny udp from any to any 1935Linux users can install iptables to do it through Terminal as well, with the commands:
iptables -A INPUT -p tcp --dport 1935 -j DROP
iptables -A INPUT -p udp --dport 1935 -j DROPWindows users should be able to follow these instructions to correctly block the ports.
http://www.scribd.com/doc/22398177/How-to-Block-TCP-UDP-Ports-Using-IPsec-in-Windows-UmaThis method should allow access not just to Hulu, but many other US-only streaming sites. Note that this may disable Flash on other sites, so you'll only want to enable this while you're watching video on one of these sites.