Jeff is right, but there's more to the story than that. I read a wired article about the guy ages ago, which I can't find the link to now (of course). Probably read it in print.
Basically "Robert X Cringely" was the name given by infoworld (I think), to an imaginary person who got the blame for things going wrong. Then one month they were short a page in the magazine, and decided to use the name for a ghost written commentary. Different people wrote as Cringely until a guy called Mark Stevens took over and used that name for a number of years, built up a bit of a rep, made it successful and so on.
He then left infoworld (or was fired), there was a whole lot of acrimonious shit, and they ended up suing each other, or he sued them, or they sued him, who the hell knows. Someone sued someone, anyway. In the end, he's allowed to use "Robert X Cringely" and compworld use "Robert Cringely", I believe. The infoworld column is ghost written by whoever, and the pbs "I, Cringely" commentary is written by Mark Stevens, who is the same guy who hosted the TV show "Revenge of the Nerds".
EDIT: Bugger, should've googled better. Found the link in 2 seconds:http://www.wired.com/wired/archive/6.12/cringely.html
(which just goes to show that wired shouldn't bother using their own search engine).