No I don't. There have been times that I enter a title so I will remember the idea and save the hub to write later. I find out from the related links that there are hubs about the subject, but I make sure that I don't read them. I don't want to be swayed by what they wrote or be accused of plagiarism.
Whenever I write a hub, I assume there are many other articles on the same subject, and I try to make sure that mine is the best, even before reading the others.