What's a 'supporting organization'?
A special kind of tax-exempt organization, dedicated to supporting one other 501(c)(3) -- or a short list of such groups.
How to start a foundation
Starting a foundation is pretty much like starting any sort of nonprofit. The details are probably even more important.
Do Foundations Ever Go Out of Existence?
Some are set up that way by the founders. The Markey Foundation produced a handbook on the process of dissolution - From Foundation News and Commentary.