From Rawhide to Stable

[davide]

Hi, I'm a (quite) new user of Fedora, but with almost 10+ years of
linux experience (debian, mostly).
I installed fedora 11 and then after few months upgraded (via
preupgrade-cli) to the rawhide branch.
I upgraded just for curiosity and to check how many rpms we'll have in
few weeks.

Rawhide works nice, almost every piece of software is there working for me.
Nevertheless, I would like to downgrade to the stable leonidas branch
(where I tested radeon driver is perfectly working for my card).

Is it possible? How should I proceed to downgrade all the rpms to f11 release?

thanks a lot, d.