It's obviously in its early stages, but I like the idea. Seems obvious that editing websites in the website itself is much more straight-forward than using some kind of backend (for small-scale CMS).
I've already posted this link in reply to others' comments but I'd love to hear your feedback on our fledgling project "designer platform" which allows you to deploy structured editing interfaces from your HTML: http://www.decalcms.com/page/Take_the_Decal_4_minute_challen...
It requires Firefox (I don't want to go back to FF), but I would consider starting it just for your site.
It requires signing up. I'm out. I have more than enough accounts already. If you want me to have a look at something, make it easily accessible. Sorry. :)
Thanks for taking a look anyway! If you'd like to email team@workingsoftware.com.au I'll configure a demo for you with a dummy email that doesn't require you to create an account.
It is obvious once you start using something like this (and especially when you see how happy non-technical users are about how much more in control they feel with their website because they actually understand what they're doing). I've had a lot of success over the past year or so using Concrete5 (an open source PHP CMS), which works in this way.