I have been doing an experiment with my tags lately. If you want to find out more, check here: http://tgn.tv/community/threads/tags-lets-test-an-aspect-of-the-tgn-guide.11494/ Anyway, I have opted to optimize tags on more of my videos and have noticed that I haven't completely filled up my tags. I'm not the person to blow over tags and when i upload my videos I spend a good deal of time working on tags and coming up with as many as possible. I did not realize that you get a full 6 lines in the text field of the "edit video" page to add in tags. If you want to try and get more views, see if you are hitting the max. Chances are you could still squeeze in a few more targeted keywords.