I'm glad that I'm not the only one who enjoyed Gall Force, thanks Thorkity !
And now another one:
Fight ! Iczer-One acts I II and III.
And not only do I like this one because of the vague Cthulhu reference, but also because the dark and unsettling imagery that was used. Couple that with the mega cute girls and (dare I say it) giant mecha battle scenes that were rilly rather fun, it's become a favorite of mine.
http://en.wikipedia.org/wiki/Fight!_Iczer_One
For those of you who haven't seen it, go get it. Warning, adult content. ^_^