Here he is on December 18th 2008. A Tobin Tax is a wonderful idea and it should be implemented.
Here he is on September 2 2009. One country is floating the idea of a Tobin Tax. This is a very bad idea which must be opposed.
The difference seems to be that we should impose a Tobin Tax upon ourselves while the Caymans should not impose a Tobin Tax upon themselves.
Quite why though is difficult to see.