we've (probably) got upcoming law in the Netherlands where i have to ask users if they allow me to use cookies on my site. Now it's easy when they say 'yes', because i can store that in a cookie.
You can see it coming: how can i remember the users choice when they say 'no'?
I only use cookies for Google analytics, so i can live with the 'no' answer and don't want to irritate the 'No' sayer every visit with the same question.
Maybe Local Storage in supported browsers for more or less permanent persisting