I'm a developer for mySociety. On Twitter, I'm @mhl20 and my homepage is here.
Stack Overflow
Q&A for professional and enthusiast programmers
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
German Language
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Server Fault
Q&A for system and network administrators
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Ask Different
Q&A for power users of Apple hardware and software
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Area 51
Q&A for proposing new sites in the Stack Exchange network
Photography
Q&A for professional, enthusiast and amateur photographers
Ask Ubuntu
Q&A for Ubuntu users and developers
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Academia
Q&A for academics and those enrolled in higher education
Personal Finance & Money
Q&A for people who want to be financially literate
Arqade
Q&A for passionate videogamers on all platforms
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
English Language Learners
Q&A for speakers of other languages learning English
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
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
Seasoned Advice
Q&A for professional and amateur chefs
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization