After Google Instant there comes Youtube Instant by Feross Aboukhadijeh a student from Standford, CA.
Feross took a bet with his roommate – Jake Becker, to create an instant search engine for Youtube Videos in less than an hour, but it took 3 hours to finish and another couple hours to polish the user interface. Feross lost the bet. But Youtube Instant gave him Instant Popularity & Instant Job Offer from Youtube CEO Chad Hurley.
The Website Show the results instantly i.e Youtube Videos as you start typing in the query and it automatically starts playing the video also.
Try Youtube Instant and do Share your views on it via comments