At the Baltimore ComiCon recently, I picked up a copy of Superboy #67. When I read it, I was pleased to see an ad for the next issue, which was the first (comic book) appearance of Bizarro. Note the B logo instead of the S logo! If I remember correctly, the actual story had the S logo.

I don't think it's been added here yet; a quick search of each page for the term "Bizarro" didn't show any hits.