Outdex
This page began by asking folks to tell me their favorite blog post that they've personally written, and my intent is to keep expanding it as I read interesting and awesome posts.
Classes
CRAFTSMAN, A puzzle by Spiceomancy
Flirting with Death, Loch's Infamous Duelist Class
Path Unending, a Chronicle Cleric by Path Unending
Meta-Class: The Monster, by Musings on Monstrousness
The Snow Falls and the Village is Overflowing with Children, A Fay Class by Purple Cthulu
The Robber, a single-level class by Temporal Negativity
Marineris Honeymoon: Mechs, by Carrion Gods.
Dungeons
The Old Apothecary, A Delightfully Spooky Dungeon by Whimsical Mountain
Theory
A Class Act, Vivanter discusses the art of writing GLoG classes.
Treasure & Economics
NPCs As Magic Items, friends who can do cool things for you, via Phlox
Twenty-Three Swords-ish, by Deus Ex Paraboloa
Procedures: Create
Another Method of Terrain Generation, Very usable advice from Phlox
Older and Fouler Things, a Forgotten Beast generator by The Red Lantern
Procedures: Play
Scrabblecraft, a harvesting/crafting system by 400 Independent Bathrooms
The Gift Economy in Play, an ingenious social barter-system by Archon's Court
Settings & Campaign Ideas
Morning Stars, a Setting by Mad Man's Menagerie
Destroyer, A Dark Baseball Campaign by Louis
How to Win the Dawn War, Gender-swapped (and amazing) 4e gods by Pilgrim Temple