Some recent finds:
Building Prestige Classes (Part 1)
Building Prestige Classes (Part 2)
Population Demographics A tighter method of stating out towns
3d6.org A Forgotten Realms (Harper) campaign
Complete Domain Spellbook
6 person party experience forum discussion
Magic Item Reference
The articles are thorough and generally good. (Not so sure about the last; I snagged it to peruse later.)