I might change my mind.......
When I started browsing this thread, I was generally in favour of ID cards. When I lived in Belgium I carried one all the time, as did she who must be obeyed, and the children. Thus I start from the "so-what" camp. In my working times, I've been vetted, referenced, and even had plain clothed folk ask the neighbours questions about me and the family. I guess that was something to do with vetting. I know that the powers that be have looked at my financials - the security bloke in one of my employers told me.
Anyway, I am moving firmly out of the "don't care" camp having read this lot. The thought that any of those lying, two-faced politicians, (Harperson, for instance, who wants to break the law over Fred the Shred) having all this access inb to me and mine - or yours, for that matter, is truly scary.