This is something that I’ve been been looking into quite a bit lately and have just posted on one of my other sites about making your video thumbnails more attractive in order to attract more viewers. A thumbnail that’s different, will stop people in their tracks while they are browsing and make them want to look at your videos.
YouTube is the 2nd biggest search engine now, next to Google, so it makes sense that it’s a great place to gather traffic.
Have a read of the post. There is also a great business opportunity attached to this, for a one off $5 cost!