Each time you search for something on Google, GoogleTube will mark any results that point to YouTube videos with an icon that takes you directly to the video. You can then download it in FLV or expand the information without ever leaving the page search.
You can choose the size of the player window as well as change the background colour.
This comes in really handy if you want to avoid searching on YouTube, which is not always the most reliable. It is also one of the quickest ways you can find to download videos to your computer.