Here's my vote. I've been using XBMC on my Xbox for over a year now (that's where the XB in XBMC comes from) and I was hoping for a single official maintainer to stick to. Afterall the sources of XBMC still build for XBox and probably always will. I hope Boxee picks up that support one day.
Additionally, I have a Debian Sid machine here in my study. I'll try the binary linux version on it (the one aimed at Older Ubuntus I suppose) and let you know if it's supported as well.