I really like using HTML5 Storage since it's so easy to implement.

There's one thing you forgot to mention. You can also add arrays and objects to HTML5 Storage using JSON.parse and JSON.stingify as listed below.

var testObject = { 'one': 1, 'two': 2, 'three': 3 };

// Put the object into storage localStorage.setItem('testObject', JSON.stringify(testObject));

// Retrieve the object from storage var retrievedObject = localStorage.getItem('testObject');

console.log('retrievedObject: ', JSON.parse(retrievedObject));

I literally got this from stackoverflow (http://stackoverflow.com/questions/2010892/storing-objects-i...)

Coincidentally I was building a small javascript bookmarklet for myself this weekend using localStorage. The bookmarklet allows you to make playlists on the fly. Check it out on http://www.jefvlamings.com/projects/Youtube/

This is a good start, but I would like to see more real world experience on 1) How will this benefit w.r.t replacing or using alongside Sessions (HttpSession in java for example) 2) Size limits - 5mb and 1mb for IE7, storages different per scheme/domains 3) Data Security