Celko has some good ideas. I don't know if they are all original, but he's to be credited with popularizing some of them.

On the other hand, I got into an email conversation with him once. I was left with the impression that he is quite egotistical, has very few social graces, and as a result is not interested in listening to Ideas Other Than His Own. Reminds me of someone else around here, as a matter of fact. We were discussing combinatorial algorithms in SQL, and I couldn't get across to him that hardcoding column names was a bad idea, and that I needed to be able to cross-combine arbitrary numbers of arbitrary-sized sets. I ended up solving my problem with an arithmetic trick, and I never did get him to understand. :-P