I have to admit I do have a beef with the way some people use the tags.

Use tags that someone might use to search for the video, not silly descriptions that are funny and clever. getting a dupe on a post usually happens when someone else's tags are so poor, the obvious searches don't bring it up.

I don't have the time to go looking right now..., but those who do this know who they are.
"Put the clever comments in the description field, not the tags!"
Oh, here's one (Sorry alien_concept)
http://www.videosift.com/video/How-To-Make-The-Ladies-Love-You-While-On-The-Rag
"chocolate bread pudding, oh my fucking god, my diet is over"

Another thing is some people don't use enough tags or descriptive enough tags...

Like this one (sorry jdbates):
http://www.videosift.com/video/Neko-Case-John-Saw-That-Number
The Tags are "music, concert, live" -- How about a person's name, song name, location, something that identifies the performance.

This one has NO Commas at all...
http://www.videosift.com/video/Snow-Falling
"snow falling uttarakhand uttaranchal bainji kandai dashjula"


I also have to mention, that after a quick look, there are also a lot of people who use the Tags quite well - so Kudos to those people! and Thanks!