As you can imagine, QTIP Trusts are especially favored in second marriages where there are children from the first marriage.  This article on bankrate.com discusses estate planning in second marriages, including QTIP Trusts.  However, the article fails to mention the use of Credit-Shelter (or Bypass) Trusts, which can also provide support for the surviving spouse but are used in larger estates because the assets are sheltered from estate taxes at the death of the second spouse to die.  Also, the article seems to say that the estate tax exemption is $1 million, which is erroneous.  The federal lifetime gift tax exemption is $1 million, but the estate tax exemption is $2 million.