Have you ever been in a long distance relationship?

Besides the obvious challenge of being apart from each other, what other major challenges did you face?
What was the hardest part for you, what really worked for you in getting past all the hard aspects of a long distance relationship?
Did one of you end up moving so you could be together?

I realize I added a whole ton of questions in the details here, I just want to hear your stories and how you made it work or why it failed.