I just did a fresh install of FC5 on a machine which previously ran FC4 and could run "yum update" with no problem.
Now, with FC5, "yum update" takes forever - nearly every attempt to access mirrors fails ("HTTP 404 file not found" or "FTP Can't change directory" errors). I am using the default *.repos file defintions in the /etc/yum.repos.d firectory.
Any idea? The initial update is taking days (literally!).