YouTube launched its Data API to let developers integrate online video into their apps, but the modest caps on daily use have limited the potential of those apps. As of today, YouTube is offering much more breathing room: developers now have 10 times more transaction units each day, and uploads require 10 times fewer units. The extra headroom should lead to apps that not only include many more YouTube videos, but also call more frequently on clip data. While it will likely take some time before we see software that takes advantage of the higher limits, we wouldn't be surprised if our favorite apps become multimedia extravaganzas in the near future.
Source: YouTube for Developers (Google+)