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I would like to add
perhaps have a second page which displays what the user has entered. Let him review if all info are correct, if they are, then press 'submit' , if not, go back and correct or correct rite there before submitting.
also, some people use an incorrect email on purpose just sign up for something.
it would be cool to have a message stating that must be a valid email because an activation will be send to that email
this might reduce mistyped or purposeful intent