osama = 38,700,000 google results
osama videos = 3,740,000 google results
osama bin laden videos = 21,800,000 google results
When you search for osama, the first link is osamamovies.com. I think if you develop this site, it could easily replace that link as the top result for the term "osama". Not to mention that osamavideos.com sounds better than osamamovie.com. However, even if you do not beat it, if you are right under there's a chance people will skip the first link and click the second because it sounds better. Also the first link won't have what they are looking for.
You would get a lot of traffic and a lot of ad clicks if you build a site for osamavideos.com. If you put some funny videos, people will definitely send the link to their friends, which would mean more ad-clicks and more revenue. I wouldn't actually sell the domain but keep it to develop a site, then if you wish to sell the site, I'm sure it could go for at least low - mid $xxxx. If you sell the domain as it is without any development, I think you would be able to get high $xx or low $xxx.
Good luck with your domain

I'm really surprised it was unregistered.