Does Hayate no Gotoku still exist? That said, anything with a harem has at least 1 ojou in it. Surprisingly, I can't think of many decent series that have an ojou as a prominent role. Anorexia: shikabane Hanako, Ojojojo (but you knew that), Domina no Do, Ojousama no Untenshu, Sankarea, Shinigami-sama to 4-nin no Kanojo, and a few other near misses.
I guess it depends on what part of the Ojou you want