Wow, thanks for all the links. I had done some searches and got overwhelmed by all of the discussion of day to day "making it work" type of discussion. We felt that they have that part pretty well covered. My wife and I have had long distance periods in our own relationship so we know that it can and does work. The big difference was that we always knew that there was a clear end in sight.
While she has me to lean on, and her girlfriend has her husband, they are still struggling with not knowing where their relationship is going long term. It is just a different dynamic than a monogamous LDR, and we are trying to figure it out.
Thanks again for all the links, we'll read through them and I am sure there will be helpful information there.