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ashlar, at this stage all non-programmers/non-developers can do is try to lobby this "XBMC Linux port project" to those already proficient in the C/C++ programming-language, do your best to convince them to volunteer (without doing it in a way that can be taken the wrong way, so do not be pushy). Developer recruiting by third-party so to speak, word of mouth, maybe you know a programmer who owns a modded/unmodded Xbox, or you you know a guy who knows a guy (friends, family, people in your sport-team, etc.), invite them over to your home and let them see XBMC in action on the Xbox or even bring your Xbox to them. Maybe you hang out at another related online community-forum for multimedia, see if anyone there is interested, etc.
...before this week is through we will try to post a public request on our news-page asking for developers, you can always wait and spread that (again, not in an unsolicitated way, as we do not want people to be put off before they will even have a change to get an first impression of XBMC in action).