Gizmodo was banned from Apple events due to their highly publicized leaking of the iPhone 4, not because of some kind of commentary on their quality of staff. And they are certainly not banned from CES. The only beef is from Apple toward Gizmodo due to them not taking down coverage Apple didn't want them to post.
I know that (about the Apple thing), but during one CES (i forget which one) they ran around the show floor and sat in presentations of various things using universal remotes to turn off TV's etc that where being used for presentations etc and then posted on there site about how much fun it was. I can't remember exactly what came of it but I know CES were not happy bunnies.
Sorry for being a bit offtopic just trying to make the point that Kotaku is just one trashy wing of a whole bird thats covered in shit :P