Hi, Darren,
I once made an animated gif of a rotating brain showing some freesurfer results. I did this with two scripts. The first is a tcl script that was passed to tksurfer; it rotates the brain and saves the resulting images. The second is a shell script that uses imagemagik to convert all of the resulting rgb images into one animated gif.
I am attaching the scripts. Please be aware, however, that the tcl script isn't very elegent. I'm actually a little embarassed by it. Also, both scripts are set up for my file system, you will need to edit a few of the settings to get them to work for you.
The tcl script is based on an earlier one I saw on the mailing list, I think it was Doug Greve's, but I'm not sure. I don't give credit in the script itself, sorry for the oversight!
+glenn