If it does make use of the HTML5 storage option, it could also possibly have a little notification at the top of the post which says "Saved to local drafts (save to server?)" and then they can click save to server if they want to be able to either store this as a draft permanently or continue it...
It could be possible to offer an SSL directory with the core, login, register and control panels on which they move to where their SSL certificate is located and then turn SSL on in the control panel.
It would be cool to have SSL Intergration, so if you have an SSL certificate on your website you can allow people to login using that, and view Administrative Areas as well as their User Control Panel through it too.