Follow along with the video below to see how to install our site as a web app on your home screen.
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You can use a Linux LiveCD that is compatible with your wireless card (preferably Knoppix or Ubuntu) and follow these instructions to make a wireless bridge for your Xbox.
If that seems too complicated I would go with the WRT54GL router flashed with DD-WRT too. I've got one hooked up to my Xbox 360 and it does its job well (with the occasional monthly reboot of course).