I tried to experiment by doing this:
[root@*** yum.repos.d]# mv rpmfusion-free-updates.repo rpmfusion-free-updates.M
[root@*** yum.repos.d]# cd /tmp
[root@*** tmp]# yum update
Loaded plugins: refresh-packagekit
skype | 951 B 00:00
primary.xml.gz | 1.3 kB 00:00
skype 1/1
Error: Cannot retrieve repository metadata (repomd.xml) for repository: rpmfusion-nonfree-updates. Please verify its path and try again
. ...if you notice, now the problem change to "rpmfusion-nonfree-updates" ..whereas before its "rpmfusion-free-updates" ..and since it seems that you guys doesn't experience this problem, then I guess all the rpmfusion mirrors were all on-line.