Is it time to say goodbye to the Penny?

Has the venerable $.01 piece outlived its usefulness? Check out the website for some of the arguments in favor of eliminating the penny. What do you think?

Pigou would say, Hooray for the Irish!

A Pigovian tax, named for British economist Arthur Pigou, is a tax aimed at diminishing an activity seen as harmful to society. An example would be a pollution tax on companies guilty of polluting the air or water.
The Irish have taken this step to rid their society of plastic bags. Could we do the same here? Should we? Can you think of other activities that could be taxed?