I am an ASP.NET and C# developer.
I also do a bit of Ruby on Rails (my blog) and Node.js (Hackerspace Status Wall)
Stack Overflow
Q&A for professional and enthusiast programmers
User Experience
Q&A for user experience researchers and experts
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Mathematics
Q&A for people studying math at any level and professionals in related fields
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
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
Server Fault
Q&A for professional system and network administrators
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
Graphic Design
Q&A for professional graphic designers and non-designers trying to do their own graphic design
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
