public domain stuff, and quite a bit of his creator owned work is readily available.
No shortage of Ditko stuff in print, but that still leaves a lot of stuff eventually needing reprinting in a nice bookshelf friendly format. Eventually I'm sure we'll see them all, but which would you like to see sooner rather than later? Assume all collections will be complete (Shade including the unpublished #9, Creeper including the unpublished Showcase #106, Speedball including all the scattered short stories). If I somehow missed the one book you'd most like to see, yell at me in the comments.