The subject of what is and what is not truly random comes up repeatedly on the Internet Scrabble Club. Unhappy Scrabble players grouse when they can't get a decent rack of letters over a span of a few games. Use this as a starting point for looking at the topic.
"A little over two years ago, a discussion briefly touched on PEAR and the so-called Princeton EGGS. In a nutshell, they are 65 random number generators,......"