>>308
Basically his work has influenced all modern sci-fi and horror, and a ton of modern fantasy. Way more than you'd think.
In A Song of Ice and Fire the Greyjoys Drowned God is clearly a reference to Cthulhu, with their symbol being a squid, and the whole "that which is dead may never die" creed and all. The fire god sounds pretty lovecraftian as well.
The nether realm in Torchlight 2 and the creatures within it look much like a Lovecraftian version of hell.
Without even mentioning the Mindflayers, when I gave Dungeons & Dragons Online a try a while back I was quite pleased to discover the first quest line has you going into someone's house to discover a secret shrine in their back built around a tunnel into the sewer line, and discover he's worshipping Deep Ones who you must then track down and fight.
Just the other day I was listening to an audio book of Felix & Gotrick while cleaning. The book was Slayer of the Storm God which I just assumed meant they'd be fighting something similar to Thor. Instead the story involved a gaggle of people turning into various sorts of sea creatures fighting them for an amulet, which when placed on someone's chest transforms them into their god, who is quite obviously Cthulhu, but with some shark bits mixed in.