These are the things I've noticed so far after running Fedora Core 3 test 2.
- xmms is not installed by default any more!
- yum uses a totally new format and isn't compatible with old repositories
- yum-arch is not included, it's been replaced by createrepo
- ships with Firefox 0.9.3 and Mozilla 1.7.2, I can't get FF 1.0PR to run