I ran across this thread via a Google Search (funny, huh?).
I've been doing a LOT of research lately into CLASSICS ILLUSTRATED as well as the Pendulum Classics series from the 1970s. Both have been reprinted multiple times, so it's safe to say neither is public domain. (The Pendulum books, by the way, were done under editor Vincent Fago, and every single one of them featured Phillipino artists.)
This is in addition to any OTHER comic book / graphic novel versions of any of these stories.
The Pendulum books are currently in print from a company called Saddleback Publishing. I found the best cover scans right at their website! I'm not sure offhand who the current publisher of the original Classics Illustrated is, but according to a letter posted at the "Tom's Place" site (where the owner was forced to take down most of the posted pages), a company named X, Inc. is the current license owner.
The letter posted on "Tom's Place" was from a "J.B., CEO". I'm guessing that's the same Jeff Brooks who posted a message here.