Software Developer (predominately C#, but not exclusively)
Interested in writing clear, concise code and performance tuning (code and SQL) and pretty much anything SQL Server related. My blog is here.
I coordinated the Perth .NET user group, in Western Australia for 5 years.
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Server Fault
Q&A for professional system and network administrators
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Photography
Q&A for professional, enthusiast and amateur photographers
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Ask Different
Q&A for power users of Apple hardware and software
Mathematics
Q&A for people studying math at any level and professionals in related fields
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Game Development
Q&A for professional and independent game developers
Physics
Q&A for active researchers, academics and students of physics
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Computational Science
Q&A for scientists using computers to solve scientific problems
Quantitative Finance
Q&A for finance professionals and academics
Personal Productivity
Q&A for people wanting to improve their personal productivity