Yeah, I think the new movie has the right touch of action and repose for kids these days. I'd start with that, except you need to really hammer home the fact that it is set in the alternate universe. Once my niece got that (and she loved the new movie), she was really curious about the older shows and movies. I should mention that she *has* seen quite a few of the older series episodes as well as First Contact, Generations, and all of the TOS movies -- so she's pretty much a Trek veteran for a 10-year old. But I agree that the new movie is a good intro in terms of generating interest in the younger kids.