Inline Rich Text Editor

I've been looking for a example of using a HTMl rich text editor in a customer site to provide the ability for wysiwyg style editing of content items.

Basically the page would be displayed as a user would see it, they would then click (or double click) on the content item in question which would then be replaced with either a text box or rich text editor where appropriate. Much like flickr does with the image title and description but also with the rich text capabilities. A lot of commercial content management systems provide this type of functionality already but I haven't been able to find an example that I could easily rip off duplicate.

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