Go to Nasa or
http://www.spacetelescope.org
and you will find links to computer animations of missions both those which have occurred and those which are still in the planning stages.
You will also find a lot of medical sites which use them for illustrations. In addition, more and more archeological sites are linking to short films about the ancient world which are entirely CGI. Check http://www.archaeology.org though they may not be linking to one right now.
