The search thing is a good point though. If I want to post a video that I found amusing, I would search first to see if it's been posted before. If I search for (for instance) "iPod Microsoft design box video" in the MR search box, I would get results for every thread that has either the word iPod, Microsoft, design, box or video in it. In other words, pretty much every thread on MR, in spite of that being a pretty specific set of words.
I'm not sure we can berate people too much for not searching when the search is so bad. I know there are other ways, like Google, but not everyone is so search-savvy, and I don't think it's fair to jump on someone who has already checked by typing their question into the search box at the top and had results they can't use. Many a time I know a post exists, and I know what words were in it, but I still can't find it using the search function.