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Recently Eliza and I signed up for Netflix. Ever since moving into our new apartment I haven't had the Xbox 360 connected to the Internet because of the location of my cable modem/router and because the Xbox 360 does not come Wifi-enabled by default.
This hasn't been too much of an issue since I haven't been playing any games using the Xbox 360 (we've been playing a lot more Wii though) and haven't needed any of the Live features. But, Netflix has an Xbox 360 application that makes it simple to stream any movies directly to your TV in HD. Daddy wants.
I didn't want to spend the money for the "dongle" or whatever it is to give the Xbox 360 Wifi capability so I was very pleased when I came across Alex King's blog post about using the Airport Express to provide a wired connection. I already have an Airport Express that I use for Airtunes to my surround sound set up which is right next to the Xbox 360. I've had Alex's tutorial 'starred' in Google Reader for weeks and today I finally took the time to get it set up.
It works great. (And the Airtunes capability remains.)
Alex links to an Apple Support article that, inexplicably, isn't complete. Where the article lacks Alex provides some tips so be sure to read both the support article and his blog post in full before you begin to help alleviate any headaches.