YouCube is a cool tool used to create a cube of content-related YouTube videos. Just select six videos, pop each url into the designated spot on the YouCube site, press return, and get a link for sharing. The cube isn't embeddable, but it certainly is a nice way to collect and share themed videos.
Since it's SuperBowl Sunday, my sample is a collection of the best commercials from years past.
View my YouCube