What's Wrong With Showing ID?

By way of Boing Boing, I find the website of this lady in the US somewhat apposite. She was arrested and faces trial for refusing to show a security guard her ID on a public bus; her side of the story is on the site. I especially like

"The fact of the matter is that demands for ID do nothing for security while making honest Americans less free. "

Worth a read, I did find the obsession the US had with photo ID rather disquieting while over there, I dread to think what it will be like if it's made the norm to carry it over here.