Does cross-training with running help swimming?

Running. Does it help your swimming or is it an interesting diversion? A lot of people here seem to cross train with running. (Some are obviously triathletes). USS teams now have their swimmers running. But does running really help swimming? For me, I'm not so sure. I think it helps a bit on the cardio side and may build leg strength. I do it to tighten everything up, because I like being outside and it gives my shoulders a break. But I'm not sure I wouldn't be better off with more pool time if my body could take it.