You have 2 options concerning repositories, you can add some compatible repositories to Extras (livna.org) or you can switch to some other repositories that are not compatible with Extras (Dries, Dag, et al.).
Compatibles with Extras
Right now I use livna.org repository. It’s compatible with Fedora’s Core and Extras repositories. To add it simply install:
After installing livna (as of 25th Oct.) I experimented some problems concerning some weird dependency problems between totem and totem-xine. Right now I deinstalled totem (and rhythmbox) to continue setting FC6 sup, will come later to check what happens with totem