Download the package and install it using the following command:
rpm -ihv laptop-mode-tools-y.xx-1.rf.noarch.rpm
where y.xx should be replaced by the version number.
As an alternative, you can subscribe to the DAG RPMforge repository, which generally contains recent packages for Fedora.
Use this spec file to build the package yourself. Note that in order to use this spec file, you will need to unpack the .tar.gz archive, rename the top-level directory to laptop-mode-tools-version instead of laptop-mode-tools_version, and the repack the .tar.gz.