If you like to find instances of people jumping to conclusions, being extremely judgmental and just pure hate, then comment search on YouTube will be right up your alley. Seriously, though, in online reputation management, the ability to search YouTube comments will be very useful for engaged companies. Thankfully, ReadWriteWeb has the goods on a real-time comment search that was very quietly rolled out by YouTube. To access it, you'll need to go directly to http://www.youtube.com/comment_search.
For the screenshot, I wanted to keep things as clean as possible, so I searched "love" and here's what it looks like:
Notice the trending topics - conduct a few searches yourself and you'll see how quickly those trending topics change. Give it a go and let us know what you think by leaving a comment.