YouTube has recently released a keyword tool, which you can find here: Youtube Keyword Tool. I played with it this past week, and it seems interesting, although I must say that I haven't worked totally the way to get the most out of it yet.
Essentially works very similar to Google keyword tool, where you search for a specific keyword phrase and you provide the exact phrase and broad match statistics for the phrase. The results are ok, but there's clearly as much data for Youtube videos yet, but I think there will be soon.
It was the first question I asked myself, "How can I use this tool for marketing?"
The obvious answer is to look at search volume keyword and develop a video around something that gets decent search volume. That is all well and good, but from what I know, if it still doesn't tell you how to easily align your video on Youtube.
After reviewing data from keyword Youtube, I decided to look for video over at Youtube, by searching on these sentences, and in particular I was looking for results where the video does not look like they have been optimized for that exact phrase.
At this stage Youtube video ranking seems to be mainly internally, IE. not in Google, "on page" factors, such as title and description, although I presume there is much more than just this.
So at this early stage, I suppose that if you can find keywords in Youtube videos that are not specifically optimized for the phrase, then these may be those could target with you video.
For example, if you find the Youtube keyword tool that the phrase "lose weight fast" has a decent search volume, and then when you search for "lose weight fast" on Youtube and not find any video that deliberately target that exact phrase, then this may be an opening at its destination.
I am not an expert in this, but that is my guess at this stage. I'm interested to know what you think, so please comment below and share some ideas on how to use this tool.