The next version of AMF will support GIF Animated image, if you want to try the tool in beta go to this url:

http://www.apachemobilefilter.org/test/AMFImageRendering_gifanimated.php

Here some little example of this new feature:

http://www.apachemobilefilter.org/img/example.gif

http://www.apachemobilefilter.org/img/example.gif?dim=50

http://www.apachemobilefilter.org/img/example.gif?dim=30

The other good news are:

AMFWebService support deflate mode. 
AMFWebService add new feature called capabilityList, to get specific capability (syntax is capabilityList=brand_name,xhtml_table_support). Thanks to Juan