Magma stands out fron the pack by using some unique features such as featuring videos not only from video sharing platforms but also from popular social networks like Twitter, Digg, Delicious, Stumble Upon etc. All the videos on the homepage are neatly organized under different blocks and into easily browseable categories.
If you want to be able to create your own dashboard of videos where you can add videos and interact with other members of the community you can then sign up with them . You can also use their bookmarklet to save videos you like.
Head over to Magma and give it a try.