Honestly, I think I'm a pretty great DIL. (and i just posted on the other thread about how much I love my MIL and SIL.) I call my MIL about twice a week just to check in (they live in Georgia). I send emails and texts all the time, and I take tons of photos with my good camera and am constantly sending them photo albums of what we did over the weekend, house projects, etc. They always are glad for those and say it helps them feel included even though they are far away. I always encourage us to make trips to visit, even if DH is reluctant. I tell her I love her and I appreciate her. She is a jeweler and when I go overseas for work I always try to bring her unique beads. I check in on MIL's father, who is widowed and not in great health. I put a lot of effort in to the relationship and I think it pays. She is much younger than my parents, so when mine are gone i know I will really need her.
My own family has a tough relationship with my brother's wife, so I have seen a less-than-great MIL-DIL relationship between her and my mom and it really sucks. So i have tried very very hard to have a different dynamic.
I think my MIL would agree, but she would want to know 1. when are we moving to Georgia and 2. where are her grandkids.

But she never actually says these things, because she is awesome.