im sure theres a nice list somewhere of all the official and community repos, but i dunno where.
anyway, here are some sources.

afm
deb http://repo.apps.formeego.org/harmattan/apps/ ./

rzr's community repo
deb http://repo.pub.meego.com/home:/rzr:...ttan_standard/ ./

mohammadag's incepted repo
deb http://mohammadag.xceleo.org/n9inceptedrepo harmattan-incepted free non-free

martinks repo, for gtk
deb http://repo.pub.meego.com//home:/Mar...attan_standard ./

djszapi's public repo
deb http://repo.pub.meego.com/home:/djsz...1.2_Harmattan/ ./

harmattan source packages
deb-src http://mohammadag.xceleo.org/n9sources_repo harmattan-1.2 free