On one of the 3D related lists I watch, someone pointed to a site called 3D Rivers. Once you register, they send you an email with links to free models each week. There were 10 free models posted this week, and one of them really got my LOTR geek going - a nazgul riding a fell beast! Its not rigged, but it is textured and has materials, and is in obj format (among others).
The site is 3D Rivers - www.3drivers.com/
Seemed too cool not to share!