Screenqueri.es - Pixel Perfect Responsive Design Testing Tool

Clickable: http://screenqueri.es/

This is the best of these tools I've used so far. Previously I used http://jamus.co.uk/demos/rwd-demonstrations/

One problem I have though, the phone menu is very long and doesn't scroll with the page, so if your window isn't as tall as the list (it only just fits on my 13" Macbook Air) then you can't see the full list.

Looks nice! But: For my site - http://davidtanzer.net - it does not produce the correct result for the new iPad. On the real device it looks exactly like on the iPad (no side bar, everything is just higher res).