When you run this tool you are presented with a search window where you can enter the topic on which you want to watch the videos.
The tool will pull out all the videos related to the search topic and start playing them one after the other and if you want to download any of the videos, just click on the download option and it will be downloaded on to your system.
Sure is a very useful tool.
Installation instruction for debian systems
sudo add-apt-repository ppa:ferramroberto/minitube
sudo apt-get update && sudo apt-get install minitube
You can find out more at