I thought this was worth mentioning; with the iPhone 4 with its HD video camera being released to day and other manufacturers no doubt following suit by adding similarly specced video cameras in the future, more and more of us are going to be carrying video recording technology with us.
Please remember your rights as a photographer, don't be bullied for recording in public: http://photographernotaterrorist.org/
Please remember your rights as a photographer, don't be bullied for recording in public: http://photographernotaterrorist.org/