I've often written code like:

short? value = 2;
short doubleIt = (value ?? 0) * 2;

Notice on the second line that the null coalescing (??) operator requires parenthesis around it before multiplying it by 2. Another options is to use GetValueOrDefault(), as such:

short? value = 2;
short doubleIt = value.GetValueOrDefault() * 2;

It's a subtle difference, but helpful at times. My primary reason for writing this short article is to get me to remember to start using it.