[photojosh]

I don't know whether it's due solely to the resolution, but I was pretty shocked to realise I can tell the difference between 300 and 600 dpi photographic prints (assuming there's enough detail in the image to do so, you need to print a 23 MP DSLR shot with high detail at a 7x10" print size to get there). I have had other photographers tell me that they don't see any benefit to retina screens at all... you're giving me the reason why here. :)