Something I'll have to study a bit, it looks really interesting and powerfull when it comes to instantly edit online content : XML Http Request or "Ajax". Here are neat examples.

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Map: Switzerland One word: wow. No flash object, just image and javascript, and lets you zoom in from the whole country map to a 50 meter scale so you can actually see houses. Did I say 'wow' already ?

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Drag & Drop for images and layers : fun, simple to use and install javascript code. Could be used for example in a "do it yourself" layout : users would rearrange things on a blog to suit their likes, and then save their layout in a cookie for future use…

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