FireshockHD
Gaming review`s fireshock moment
Tags are very important using certain keywords, titles, similar related tags to ur video they are very important without tags we would all be buggered
The most important parts are the title and description.
They have a stronger effect in search results. I usually use tags similar to the title, and then generic ones like "humor" and such.
Generic tags will have little to no effect on your videos, if you tag humour and someone searches humour your video will likely be 1 in a pool of several thousand videos, where as if you use keywords specific to your video with low competition but a high search rate, you will rank high.