If you are a habitual visitor to the YouTube web, a program like this will be very useful to you: Youtube Browser. It is a tool that lets you make very effective searches, view videos, download them to your hard drive, upload other videos to the web ... all directly from your desktop, without needing to connect to YouTube.com.
This way you can interact with the whole YouTube universe, as if it were a normal application on your PC. Look for a video like you look for something on your hard drive, and with one click you`ll be watching it. Another interesting Youtube Browser option is to be able to play a YouTube video in the background, without interfering with your work or daily tasks. Very complete and effective.