It has been over one and a half years since I updated my Titles Available in More Than One Format in the U.S. page.
I received a few suggestions from Ono-san and ended up spending almost the entire day sitting here updating the lists.
This project is an attempt to list every manga or anime item that exists in more than one format in North America. This includes live action movies and prose fiction.
I hope folks find this a useful page, it originally created it to help librarians locate such items.
Please let me know of any errors, I'm sure there are some in all of that text.