Lawnchair (http://brianleroux.github.com/lawnchair/) is similar to this, but you have to pick an adapter (see http://github.com/brianleroux/lawnchair for browser list).
PersistJS falls back on flash and cookies, which is bad (flash slows down browser during page loading, cookies fatten your network requests). Store.js uses localStorage, globalStorage and IE behaviors which do not have those negative side effects.