TunerFree MCE is a fabulous plugin for Media Center that bring all of the live TV and catch up programs from the UK's main TV providers and now US online video content, directly in the Media Center interface, including: BBC iPlayer (BBC 1, 2, 3 & 4, CBBC and CBeebies); ITV 1, 2, 3 & 4; Channel 4; Five Demand; Hulu. Live streaming is also available for ITV and BBC. Note, since live streaming is a form of broadcasting, legally you must own a TV license to watch that content. We are also currently trialing a beta version which plays Hulu content for US viewers.
The latest beta 2.2.4 now allows you to automatically switch between your standard IP address and a proxy service such as AlwaysVPN which allows you to access US only web content from outside the US. Hurrah, hulu will be mine at last! You can find a guide for using the plugin with an OpenVPN-based service here.
More info: TunerFree MCE