Do you spend as much time as me on youtube? If yes, then by now you would be going mad by those google ads on the video and above the poster box on right, right?
Worry no more, if you use Firefox (which all wise people do :P) then go here and install the plugin. It does two things:
I came across it today after wasting a lot of time in getting mad on youtube, hope you read this post in time and save your anger for someone else, just kidding :P