Piclens has been out for some time and thousands have downloaded it. In August they released their latest version under the name Cooliris. The plugin for firefox allows you to search youtube, flikr, google, yahoo, devianart, amazon, smugmug, photobucket and more all from the same window. The plugin provides you with a normal 2D interface, but what takes it to the next level is the 3D interface that represents the Apple graphic of the Apple TV startup, the one with all the videos playing at once.
Once you search you get the list of the videos with previews on each one. Click what you want and it plays instantly, more quickly than on youtube itself, for example.
If you are an avid firefox user or not this application is worth using and it’s free.