With distance between you, communication is really key. And the biggest thing is to talk about all the little things... and the day-to-day activity they would be a part of if they were physically present. You might think you are over-communicating about mundane, boring things... but the truth is that you are sharing the intimacy of daily life with you.
And technology can be your friend here. Skype is a great solution for face-to-face... but keep texting to brief updates. Text messages are completely subjective when it comes to meaning and tone.