martinibuster - 8:30 am on Nov 24, 2007 (gmt 0)

Maybe this isn't your issue, but it might be useful to someone else. The link only shows within around the first 47 characters of the description. Beyond that the user has to click on the "Show More" link to see your URL, driving down the likelihood of a click through. If you post a video and want to encourage click throughs, do a variation on a description like this: "http://www.example.com presents a video about bla bla bla..."

Funny thing about this, is that I attended an SES session in San Jose about optimizing YouTube videos and not one speaker mentioned placing the URL at the beginning of the URL. One of the people presenting showed a snapshot of one of his YouTube videos and it didn't have the URL in the first 47 spaces of the description. lol