Ok I got it installed. It came in an autopackage, which was a first for me, but generally pleasant. It added some utility called 'manage 3rd party software' to my "system tools" menu that allows me to remove amsn. This seems like some sort of distro independent package manager...
Anyway, it looks nice. When I tried to set up audio it complained that I was missing the snack extension. Apparently you need libsnack.so. The only place I could find this was in a Fedora core 3 package from DAG
http://dag.wieers.com/rpm/packages/libsnack/ - it 'seems' to work though. I wonder if there is a better way to install this. Presumably when amsn .97 hits the fedora repos they will include libsnack?