I've upgraded a couple of times using yum, from FC6 to F8, then F8 to F9 and F10. The trick is to first update Fedora-release and Fedora-release-notes manually from the F9 repository (download the rpms, then use rpm -Uvh), clear yum's cache, and finally yum upgrade.
When I've tried this, there were usually a few false starts due to dependency errors. In most cases, there was x86_64 package installed, but not a i386 cousin of the same revision, and somehow yum couldn't figure out what to do. I would either delete the package if not critical, or manually upgrade it, then proceed with the upgrade. The number of dependency errors was small, so I was able to successfully get through the process.
I recommend you image your system before starting, so you can easily go back if you want. I hate what they did in KDE4, and Fedora 9 has no option to stick with KDE3.5 - you may or may not like KDE4 yourself. I tried F9 and F10 (slightly better), then finally reverted to Fedora 8, which is where I intend to stay.
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