Simply manage your "playlist" by ordering your youtube tabs.Install:
Add te extension to Google Chrome and reload all your Youtube tabs.
Usage:
1. Open one Youtube video tab, the video starts playing automatically (as usual)
2. Other Youtube video tabs will be paused when loaded
3. When the 1st Youtube tab is almost done, it will crossfade with the next Youtube tab. When you play another Youtube tab, all other Youtube tabs will be paused.
Known bugs:
Occassionally a video is not automatically paused, working on this...