I don't think there are any fellow cultists out there who are into the Call of Cthulhu rpg, but this site is wonderful and a real exemplar of what a gaming community can do.
http://www.yog-sothoth.comSorry if this comes over as a bit evangelical, but by god, I love this game and this site.
Yog-sothoth is massive. It has everything you need to get into the game, including free quickstart rules downloads.
They have an incredibly robust forum for players, absolutely everything is or has probably been discussed at some point. Many writers for the game chip in on the forums. There are forums about all aspects of the game, such as rules issues, Delta Green ideas, historical advice regarding whether or not flashlights were available in 1926... and basically all things Lovecraftian are welcome. It's such a welcoming community they have there.
They also produce a couple of regular podcasts and have won awards for these. They are free, and are always running through some marathon campaigns or other which they commit to audio for your enjoyment. The first they did was Masks of Nyarlathothep, which is regularly touted as one of the best campaigns ever produced, so you can find out for yourself. They take a little perseverance, but you might enjoy the banter and unfolding story even if you don't know the system or game.