At the time of writing, RPM Fusion still has not published a link to the stable repo for Fedora 15. You may have installed the stable RPMs and got an error like this:

[Errno 14] Could not open/read file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmfusion-nonfree-fedora-15-arch

The workaround for now is to disable the GPG check.

Install as usual:

su -c 'yum localinstall --nogpgcheck http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm'

In your

/etc/yum.repos.d/

, you should disable the gpgcheck option.

e.g. In your

/etc/yum/repos.d/rpmfusion-nonfree.repo

file, set

gpgcheck=0


[rpmfusion-nonfree]
name=RPM Fusion for Fedora $releasever - Nonfree
#baseurl=http://download1.rpmfusion.org/nonfree/fedora/releases/$releasever/Everything/$basearch/os/
mirrorlist=http://mirrors.rpmfusion.org/mirrorlist?repo=nonfree-fedora-$releasever&arch;=$basearch
enabled=0
metadata_expire=7d
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmfusion-nonfree-fedora-$releasever-$basearch

Or, you could download the gpg keys as stated in this post: NoteIts in Spanish.