Zenescope Entertainment has recently added Oz to their list of magical realms that their Grimm Fairy Tales comic series takes place in. This connects several fairy tales and childrens stories into one collected universe, although some of them exist in seperate realities. The comic primarily deals with Sela who gains the ability to travel to different fable lands, and tries to set things right in them, kinda like adult-Disney version of Quantum Leap. Sela has to deal with her evil genie sister Belinda who keeps screwing up fairy tales. Spinoff titles from this included several Wonderland series, Neverland, and an Arabian Nights comic featuring Sinbad.
A while ago, it was hinted that Oz was connected to this whole mishmash of fairy tales. Then, in issue #64 of the regular Grimm Fairy Tales comic, it was revealed that Oz was one of four other magical worlds created at the beginning of the universe, along with Wonderland and Neverland. They bring up a previous chapter featuring Thane, the "Warlord Of Oz"(no relation to that other comic!)who is an anthropomorphic version of the Cowardly Lion that teamed up with several other heroes from other worlds to stop the menace known as the Dream Eater that threatens to destroy all the fairy tale worlds.
The prequal comic of Grimm Fairy Tales: The Library shows a teenage Sela who gets trapped in a mystic library where the books in it open doors to the worlds they take place in. Sela accidently releases dinosaurs from one book, and then she is cornered by the Wicked Witch of the West and her flying monkeys. This is a 5-issue series that is more intended for all-ages, although it doesn't seem to bleed into the regular comic series much.