IO9 has a brief overview of horror that tickles the funny bone, whatever the intent might have been. The article writer warns that the article wasn't intended as a comprehensive retrospective; rather, it addresses the categories: 1920s stage plays, comedy teams and camp of the 30s and 40s (Abbott and Costello, for example), 60s anarchy, self-aware campiness, Ghostbusters/Gremlins and more, Troma comedies of the 80s (Surf Nazis Must Die), werewolf/vampire humor, body horror/comedy, the rise of Sam Raimi, Christopher Moore, creature features, Buffy etc., Chucky/Leprechaun films, horror spoofs, and zombie romance/comedies.

IO9 posted some nice graphics with this short look at horror-comedy film history.