publish much, but there was a lot of Ditko among his books, and some more planned unrealized Ditko projects discussed in his essay, including a project with Jerry Siegel with some concept art.
I'll post more on the published ACE Ditko comics soon, here are some previous posts about them:
What Is... The Face #1 
Ace Comics Presents #1 
Return Of The Skyman #1 
Single issue and subscription information are over here, and the Ditkomania mailing list is down this way.