Estonia includes cryptographic keys with their identity docs, it's like plugging in your passport to be able to prove your identity and sign documents. It sounds like a great system, they only had to re-issue certificates once a few years ago when they realized the keys were too weak, but I can't find any other country that's taken up the decade-old technology.

They also have a state-provided email inbox for official communications, which I wish we had. A friend of mine had her car towed because the registration had lapsed -- she had ignored a letter from the DMV asking for proof of insurance b/c it looked like a scam to her. If only the government had a way to prove ITS identity.