hddtemp is a small utility (daemonizable) that gives you the temperature of your hard drive by reading S.M.A.R.T. informations (for drives that support this feature).
Everything is now hosted on Savannah, so sources can be found either here for tarball versions or here for Arch repository.
gkrellm-hddtemp-0.2-beta.tar.gz (this version works with the deamon mode available from the 0.3 version and SHOULD compile for every version of Gkrellm).
And DO NOT FORGET the last hddtemp.db.
Mailing list
hddtemp-announce@guzu.net is now obsolete, you should now choose one the mailing lists at Savannah.