See here: http://lists.berlios.de/pipermail/supertux-devel/2007-December/000754.html
It looks like saved games from 0.3.0 don't work on 0.3.1, so I don't think this would be appropriate for a Fedora 8 update. Thanks for the heads up.
I guess this is intentional as supertux isn't "final" yet and the levels are pretty much in flux between the version (one time where a 0.x version lives up to its promise ;-)!).