As you can tell from my posts, I'm a big fan of the various Dungeons and Dragons comics released over the years. Starting with the TSR/DC comics released back in 1988 through the latest IDW comic that wrapped up in 2012.
I thought I knew of all/most of the D&D related comics, until I found this site: http://kuronons.blogspot.com/
Here, you can find a full chronological list of comics, including the original D&D comic ads as well as plenty of one-shots and promos that I never heard of.
While the information is complete, as of 2012, sadly, it seems not to have been updated since then to include the few new D&D comics that have come out in the last few years.
If you have some time, check out the site. Not only does it detail plenty of D&D comic goodness, but there's also information on some unusual treasures (like the Dragonlance baseball cap!) that I was completely unaware of.