Upgrade GNU/Linux Fedora from 8 to 9, then 10 (with yum)

To upgrade GNU/Linux Fedora from 8 to 9, then 10, there is no problem.
It is easier than previous upgrade, and there is less kind of issue.

The principle is globally the same when upgrading from Fedora core N to Fedora core N+1 (see this post), from Fedora core 6 to Fedora 7 then 8 (see this post), or from Fedora 7 to Fedora 8 (see this post).
In addition, the recommendations of Fedora project have greatly evolved and seem now complete.

Upgrade from Fedora 8 to Fedora 9:
- do not forget to clean all the yum metadata with yum clean all,
- upgrade the Fedora release:
rpm -Uvh ftp://download.fedora.redhat.com/pub/fedora/linux/updates/9/i386.newkey/fedora-release-*.noarch.rpm
- upgrade your repository if needed (N.B.: livna has now merged into RPM fusion)
- remove and reinstall thunderbird to avoid specific issue.

Upgrade from Fedora 9 to Fedora 10:
- do not forget to clean all the yum metadata with yum clean all,
- upgrade the Fedora release:
rpm -Uvh ftp://download.fedora.redhat.com/pub/fedora/linux/releases/10/Fedora/i386/os/Packages/fedora-release-*.noarch.rpm
- Be careful if you have RAID, there is an important issue which may prevent the OS from booting properly

Ensure there is no dependencies problem like explained into this post.

Then, you should perform a great configuration files merging campaign to ensure having the up to date functionalities while keeping your own specific configuration (globally the XXX.conf and XXX.conf.rpmnew files).