Favourite programming language: Haskell
(I also quite like Python.)
See my other favourite things on my Wikipedia user page.
Q&A for professional and enthusiast programmers
Q&A for Ubuntu users and developers
Q&A for computer enthusiasts and power users
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Q&A for people studying math at any level and professionals in related fields
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Q&A for enthusiasts and power users of the Android operating system
Q&A for professional programmers interested in conceptual questions about software development
Q&A for professional system and network administrators
Q&A for programming puzzle enthusiasts and code golfers