JQuery.store is a project mainly written in JAVASCRIPT and RUBY, it's free.
A tiny little key/value store that uses the HTML5 localStorage feature if available, and otherwise falls back to jQuery.cookie (you have to include this yourself, find it at: https://github.com/carhartl/jquery-cookie)
$.store.set('foo', 'bar')
$.store.get('foo') // => 'bar'
$.store.remove('foo')
$.store.get('foo') // => null