Here's all you need to know about Level UP #2 okay?
Call of Cthulhu monsters. That's right, BlackDirge's Bestiary brings up several varieties of Deep One, including Dagon, and shoggoths. Now it's not a complete bestiary or anything but it's well illustrated and on the net, it's going to get a follow up. All good news.
Now if that was not enough for you, there's an adventure featuring the old monsters of the mythos as well. This 12th level Cthulhu Crawl Classic, starts with the players hired to avenge a captain's crew against a village whose inhabitants are just not right and to discover the secrets of the monolith! It's good fun and a good way to introduce some of the more 'sword and sorcery' elements of the mythos to the D&D game.
While I didn't like everything about the book, races with details to allow players to play 'good' versions of evil character, the adventure and monsters are enough to make up for that with ease. Throw in some other columns that I enjoy like Dear Archmage Abby, an advice column, and Azgar's Advice for Adventurers, and it's a solid sell.
[4 of 5 Stars!]