on Jane Friedman site:
Awareness of estate planning issues can be especially important to writers because of the unique nature of property rights in written works. Proper planning ensures that the ownership of a writer’s works after his or her death will end up in safe and knowledgeable hands.
In addition to giving the writer significant posthumous control over his or her works, an estate plan can greatly reduce the overall amount of estate tax paid at death. Because valuations of written works for estate tax purposes are not precise, estate taxes may turn out to be significantly higher than might have been anticipated. Thus, it is very important for writers to reduce their taxable estate as much as possible.