I googled it and saw several people complaining of IBS like symptoms. Most of them had the surgery less than 1 year ago. I also read on wiki that the appendix can act as a "safe harbor" for intestinal flora in times of illness. Some of the people who were having problems had improvement with probiotics.
My boyfriend had an appendectomy when he was a kid, and his digestion is very different from mine. He is sensitive to certain fruits, especially first thing in the morning. These things may or may not have anything to do with having his appendix out. Are you having problems and you think that is the cause?