OK I'm going to be the first to stick my head up and say that I think ID cards are a good idea, in principle, not on the basis that they are being proposed at the moment but ...
Firstly, those who think that the government are only proposing ID cards because they want to spy on us, what do you have to hide? Reality is that if the government wants to know what you're up to, they most likely already know anyway, and if they don't already know, if they have reason to suspect you, then they have ways of finding out.
Secondly, do you have a driver's licence? do you have a passport? if so you already have a form of photo ID.
Have you ever been to a shop to buy something, a mobile phone, something on interest free credit, open a bank account, and they've asked you for ID? How annoying is it to have to go home and find two pieces, one with your photo on it, and one with your address on it? So you have to go routing through your drawers to find an up-to-date electricity bill, and passport or drivers licence? If you have an ID card which you carry, you only have to present it, and your purchase will be approved without having to go through all the hastle.
How much does benefit fraud currently cost the government? If people who are claiming benefits had to claim using their ID cards, it would stop the thousands of people who currently claim benefits in more than one place, because they would be on record as claiming somewhere already, and if they tried to claim in someone else's name, that person would be on record as in gainful employment and therefore benefit fraud would be reduced signifficantly, not iradicated, but reduced.
How many under age kids are currently allowed into pubs/clubs/allowed to buy alcohol/cigarettes because they can present a fake ID? If we had ID cards this would no longer happen.
I don't agree that ID will stop terrorism,there has to be a convincing argument for that, but if terrorists want to come into the country and blow up innocent people then they will find a way to do that, but I do think that there are benefits to having ID cards. I also don't think that we should have to pay for them, and I do think that they should be compulsary, otherwise the system will be unworkable.