With Tube Keys you can use your multimedia keys to control YouTube playlist, Next button to jump to next video. Previous button to jump back to the previous video.
The extension is avialble on chrome store, checkout https://chrome.google.com/webstore/detail/kpineejfaemilcdokmbfcjcefhkgimho
Some copyright info
The extension is licensed under the MIT license, feel invited to fork, port and transmogrify all parts of it.
The icons I've used as promotional images were a collage, and include some of the work by @deleket (Jojo Mendoza, twitter.com/deleket) such as the next, prev, pause, stop buttons. The background keyboard is work by rg1024 (http://openclipart.org/user-detail/rg1024).