Web developer, podcaster, Ars Technica columnist.
Stack Overflow
Q&A for professional and enthusiast programmers
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Server Fault
Q&A for professional system and network administrators
Ask Different
Q&A for power users of Apple hardware and software
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Game Development
Q&A for professional and independent game developers
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Physics
Q&A for active researchers, academics and students of physics
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Photography
Q&A for professional, enthusiast and amateur photographers
User Experience
Q&A for user experience researchers and experts
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Academia
Q&A for academics and those enrolled in higher education
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Ask Patents
Q&A for people interested in improving and participating in the patent system
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Personal Finance & Money
Q&A for people who want to be financially literate
Writers
Q&A for authors, editors, reviewers, professional writers, and aspiring writers
Graphic Design
Q&A for professional graphic designers and non-designers trying to do their own graphic design
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business