Agile software handyman...
Geek and Vimthusiast
On Down-voting
About two percent of my votes are down-votes, which I think is quite low. Down-voting is an important part of StackExchange and helps separate the good answers (and questions) from the not-so-good. If I have down-voted one of your posts, I will have left you a comment as to why. If you down-vote one of my posts, I ask that you, too, leave a comment as to why so that I can either improve my post or remove it. Thank you.
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
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
Ask Different
Q&A for power users of Apple hardware and software
Server Fault
Q&A for professional system and network administrators
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
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
User Experience
Q&A for user experience researchers and experts
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Photography
Q&A for professional, enthusiast and amateur photographers
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Personal Productivity
Q&A for people wanting to improve their personal productivity
Quantitative Finance
Q&A for finance professionals and academics
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Homebrewing
Q&A for dedicated home brewers and serious 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