i belong to the btv beta forums located here. the current version of btv is 3.4 but the upcoming v3.5 will have an open interface that you'll be able to develop plugins for. although i know there is an xbmc pc version being worked on this would be an opportunity to add a plugin to the xbox similar to anyone familiar w/myhtpc. currently, myself and many others use btv to record and manage recorded shows and then use the xbox to watch those shows.
anyway, when the question of an xbmc/btv plugin was approached ont he forums one of the snapstream developers replied to the thread, "if you know any xbmc developers, we'd love to add them to the tech preview." i think at the very least an interested developer might want to take a look at the btv code and see if there's anything that can be integrated into xbmc. if you're interested let me know and i can pm the snapstream developer on the other forum.
anyway, when the question of an xbmc/btv plugin was approached ont he forums one of the snapstream developers replied to the thread, "if you know any xbmc developers, we'd love to add them to the tech preview." i think at the very least an interested developer might want to take a look at the btv code and see if there's anything that can be integrated into xbmc. if you're interested let me know and i can pm the snapstream developer on the other forum.