Tobin tax has some key new supporters.

http://www.cbc.ca/news/business/story/2012/09/28/europe-tobin-tax-transactions.html

Germany, France pitch Tobin tax on financial transactions

Sounds interesting ...

http://en.wikipedia.org/wiki/Tobin_tax

A Tobin tax, suggested by Nobel Laureate economist James Tobin, was originally defined as a tax on all spot conversions of one currency into another. The tax is intended to put a penalty on short-term financial round-trip excursions into another currency.