GIMP transparent background

It is quite easy to do transparent background with GIMP.

Clear demo is here:
http://www.fabiovisentin.com/tutorial/GIMP_transparent_image/gimp_how_to_make_transparent_image.asp

Note: Save as GIF (transparent background capable)

GIMP Animated GIF

It is not quite straight-forward to do animated gif.

The following is the solution with GIMP.
http://www.csb.yale.edu/userguides/image/moviemaker/anim_gif.html