A long time nerd who has worked with more systems (embedded, micro, mini, and big iron) and languages than I care to remember, but right now I stay on MacOS X and iOS programming using Objective-C to eat and sleep indoors, and for fun I do Scientific Computing with Python.
Stack Overflow
Q&A for professional and enthusiast programmers
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Ask Different
Q&A for power users of Apple hardware and software
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Computational Science
Q&A for scientists using computers to solve scientific problems
Quantitative Finance
Q&A for finance professionals and academics
Mathematics
Q&A for people studying math at any level and professionals in related fields
