My article "Why Worldwide Welfare as a Normative Standard in Tax Policy?", 60 Tax L. Rev. 155-178 (2007), has now been published. Hard-copy reprints are available to anyone who still wants so old-fashioned a thing.
Another forthcoming article of mine, "Beyond the Pro-Consumption Tax Consensus," should be appearing very shortly in issue 4 of Volume 60 of the Stanford Law Review.
Finally, within the next few weeks my article "Disclosure and Civil Penalty Rules in the U.S. Legal Response to Corporate Tax Shelters" should be appearing in Wolfgang Schon (ed.), Tax and Corporate Governance, to be published by Springer Science. This volume contains the papers from a conference that was held in Munich in December 2006, and other authors whose papers should be in the volume include, e.g., Reuven Avi-Yonah, Steve Bank, and Mihir Desai.