I'm a member of the ACCU, and I spoke at accu2012 in April.
Q&A for professional and enthusiast programmers
Q&A for peer programmer code reviews
Q&A for professional programmers interested in conceptual questions about software development
Q&A for computer enthusiasts and power users
Q&A for system and network administrators
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Q&A for Ubuntu users and developers
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Q&A for power users of Apple hardware and software
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Q&A for people studying math at any level and professionals in related fields
Q&A for programming puzzle enthusiasts and code golfers