European plugs have an earth pin configuration with a longer pin and a shield just like in the UK. Its just a little odd because the earth pin is on the socket not the plug. I know because I lived in Paris for a year and because I still have some.
However doesn't this miss the point. The vast majority of devices nowadays are not 3 pin at all. They are double insulated and have that two concentric squares symbol. That means they don't need three pins.
Think how many devices and bricks you have with plastic earth pins. Well guess what they don't need the earth connection!
There are also sound arguments to suggest that the fuse protects only the mains lead especially so is it really important!
You have to remember that european houses are star wired, not ring wired so that overloads are not so likely and the wire is effectively fused at the distribution unit.
Moreover I used to be able to buy mains extension leads in france that look just like the "extension plug" in the picture. They are a small square box with rectangular two pin sockets so they can only be used for two pin leads.
It strikes me as more economically viable if
a) We all used two pin european plugs when possible.
b) I think the plug extension socket idea is great but might be more practical if it were say a push on 8 2 pin socket device for a double socket uk pair along the lines of those 2 to 4 socket or 1 to 3 socket converters you find.
c) The real bane of my life is power bricks. Lets have a decent low voltage standardisation of both socket types and voltage. If you want to be green you can then stop selling lumps of metal and plastic in every damn gadget box
I think the cleverest bit of the demo, is making a two socket usb adaptor to fit in the form factor
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Rajiv