Her voice (Score 1)

I work for an online memorial company, don't worry not a shameless plug though. One of the more popular thing people are doing on our site is recording their loved ones voice before they pass away. When my grandmother died I often wanted to hear her voice and now it had faded to where I can't even really remember what she sounded like. I know you said you've taken video but I'd recommend even just a short audio recording, ask her to say how much she loves you, then ask her to make one for each of your daughters as well. Once she passes you can take a moment throughout the day no matter where you are(I assume most people have mp3 players with them now, even if it's on their phone) and listen to it, reminding you of your wife and how much she loved you.