Great RPG Blogs:
Roleplaying theory from Ben Robbins — a superb (if infrequently updated) site.
Role-playing Games – Stack Exchange
Not a blog per se, but a great resource. Type in a question, get a community of interested roleplayers to answer 🙂
Great Game Mastering advice from an inspirational blog.
Call of Cthulhu Resources:
Arguably the home of Call of Cthulhu online. A wealth of material for Keepers and other aficionados.
H.P. Lovecraft Historical Society
Cthulhu LARPers gone large. Their handouts and fonts are fantastic. So too the radio plays.
Complete collection of Lovecraft’s writings.
Mythos related blog collecting links to useful play aids, props and resources.
Vampire the Requiem Resources:
More editable character sheets than you can poke a stick at.
Other cool stuff:
Home of the indie RPG revolution.
Recommended by a friend, the GMing advice is top notch.