Earlier quoted context omitted.
Interesting. I was thinking about using something like a hidden frame. Some StackOverflow posts mention storing data in "window.name". But we need something secure to store the user auth token...
You should consider using one of the toolkits, many of them have something akin to Dojo's storage http://ajaxian.com/archives/dojostorage-offline-access-and-p... . This buffers you from the implementation details and as newer browsers come along they are able to update the implementation to take advantage of newer browsers built in databases, while providing you with the same backwards compatible API. If you have not…
I did send an email yesterday, the title is "Your approach to web development. I realize now that the title might look like SPAM :) Anyway those questions were answered, I'll send you another one.