Unless a political upset occurs, the only real question is how long the ban will be extended. It might be permanent. Anti-tax advocates sympathetic to the interests--and pocketbooks--of Internet service providers went head to head with tax administrators at a congressional hearing Tuesday over legislation that would permanently ban local and state governments from taxing Internet access. Congress has already enacted the 1998 Internet Tax Freedom Act, which was reauthorized for two years in 2001 and renamed the Internet Tax Nondiscrimination Act. The goal each time was to shelter a budding industry from local and regional taxes. Former Virginia Gov....