Ranked in these QuestionsQuestion Ranking
Pros
Pro Free
Pro Nothing to install
Pro Downloads can be started by adding ss before youtube.com in the browser's address bar
http://www.youtube.com/watch?v=SC4xMk98Pdc --> http://www.ssyoutube.com/watch?v=SC4xMk98Pdc and paste into the address bar. It will analyze the link and ask you to choose a video format and resolution. Click "Download" and your download will start.
Cons
Con Confusing
There are several "Download" and "Install" buttons scattered across the webpage, making it confusing for those new to the page.