Cynthia M. Ohlenforst (K & L Gates, Dallas) has published The New Texas Margin Tax: More Than a Marginal Change to Texas Taxation, 60 Tax Law. 959 (2007). Here is part of the Introduction:
The new law, effective for reports filed on or after January 1, 2008, imposes an entirely new “margin tax” on taxpayers, subjects additional businesses to this franchise tax, and fundamentally changes the way the tax is calculated. Like other taxes based on activity during a period prior to the report year, the tax reaches back to 2007—and even earlier for some taxpayers.



