He makes a few appearences in the "Incomplete..." series I mentioned. At least the first and last issues (I think it ran for 12 issues), and in the last one there's multiple versions of him (future/past selves, etc.). Nothing terribly respect worthy, but interesting if you're a follower of the character.
Mine are the main characters, DHI and DHII. But DM is definitely the most powerful.
Awesome power. Simply awesome. Awful if you're a fan of continuity of powers that make sense for a character (he's a robot who can project onto the astral plane?!) but spectacularly hilarious for fans of DH.