Stereoclip

Stereoclip is a music video player that works with iTunes. When you are playing any song in iTunes Stereoclip will search YouTube and play the music video which matches that song.

There is no setup required, simply start playing a song in iTunes open Stereoclip and it will automatically search for and play the best video match. When the song changes in iTunes Stereoclip will then search for the next video.
What's new in this version:
Thumbnail selector for the first ten video matches on youtube. Video / Audio time syncing. Fullscreen mode (right click)