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The rendering of animated gif files should work just fine! There have been issues previously but as far as I know, they've all been fixed.. I'm not sure (I don't think) that those fixes were included in the latest stable release (0.97.2) so you might need to try out the SVN version (instructions available here : http://amsn-project.net/wiki/SVN
If it still doesn't render correctly with the SVN version, please post in here which version you were using (the svn revision can be viewed in the about window) as well as the problematic image, so we can try and fix it.