So between their recent announcements of Kase-san, Maid Dragon, and Secret of the Princess, their stuff listed on Amazon but not yet officially announced like Bloom Into You and the Kindred Spirits manga collection, and their upcoming releases and continuing series like Netsuzou Trap and Citrus, Seven Seas is basically saving yuri manga single handedly. Everything I just listed off I already know to be good too, except for Princess which I haven't read anything of yet.
I have eight volumes of yuri stuff alone on preorder from them, plus other stuff like Nurse Hitomi's Infirmary and Franken Fran (new volume just came in today!) kicks that up to over a dozen books. Seven Seas is doing good work.
EDIT
Non-gushing about licensed stuff: A scanlation of a yuri oneshot called Water Depth was just released. It was nice.