dont put the url to direct link it to the forum. You can break it after like suggested above, but the best is just to copy and paste the url without the [url] tags. This forces the person to copy and paste the url in their browser
it would be better to use the [php] tags like this:
PHP Code:
http://s99.yousendit.com/d.aspx?id=...ELXTGFOEY DDGDS
it makes it easier to see the link.