Indians's Gov. Mitch Daniels signed to repeal the inheritance tax for deaths after Dec. 31, 2021. The relief is retroactive to January 1 and increases amounts exempt from the tax for 2012 deaths.
Currently 22 states and the District of Columbia impose an estate / inheritance tax in 2012. See Forbes article on Another State Death Tax Kicks the Bucket, Will More Fall? for more information on this topic.
If you live in a state that has an estate tax or inheritance tax you may want to consider the additional taxes that your estate or beneficiaries might be subject to in your planning.