If we weren't expecting our first child, my husband and I would make a pretty good team, and might have applied. Of course, I'd come off as a complete witch, and he'd come off as the super sweet, funny, put upon guy... who married a witch. I'm definitely the more assertive. I'm another one who doesn't like conflict, but generally doesn't lose if drawn into it. We'd be great television, but I'm sure I'd be hated by viewers and my husband would be loved.
I actually suggested my husband apply with my mom; I thought Team Mother-In-Law would be great fun. I think it's a great concept, the real problem is that they get along so well that it might not make for good tv in reality. That, and the fact that my mom (and I, for that matter) need to eat regularly or we get um... difficult. And all of us need our sleep, and I can't see us getting enough quality sleep on flights and at pitstops. That said, my mom wouldn't do it, she prefers to travel first class anyway.
My half-sister actually applied with her best friend/roommate, but I don't think they've heard anything. I thought about suggesting she apply with my husband, but even I'm not crazy enough to send my husband off around the world with my sister! (They would actually be a great team. They're both funny and have more laid back personalities than high strung type A me :-) )