After giving a talk a few months ago on Client-side Storage, I was asked my DrDobbs.com to write it up in article form. Well, thankfully, I'd actually written most of the slides up already in my speaker notes, so it wasn't too much work to article-ize them. We split the article into two parts: 1) Understanding Client-side Storage in Web Apps, an overview of all the options like cookies, file system, and indexed DB and then 2) the localStorage API, a deep dive into localStorage and ways to use it. Give them a read - they might give you an idea for ways to use client-side storage that you hadn't thought of before.
Now, if only I had time to turn all my talks into articles...!