Ever wondered what the resolution of your eye is? I know I have thats why I was a little excited after I found this little article floating around the net.
The article does mention that most people can’t distinguish the quality difference between 300dpi and 150dpi when printed on a 6×4 print, but lets be honest either one of those is a very large amount of data on a very small print. They do say at normal viewing distance but I think if you got up real close most might be able to tell the difference.
Well anyway its a cool little bit of trivia.