I've had a few duplicate questions in my day, but they're all because when I ask a question the original doesn't show up in the list of Related Questions. I make it a point to look under Related Questions so I can get my answer faster. As much as I enjoy getting reputation for good questions, when a good question is already asked, I prefer to have my answer than more reputation. What's odd is that some of my dupe questions have had titles that were very near duplicate titles as other questions.
What can I do to further ensure that my question is not a dupe?