Stackoverfow
Good at CSS, HTML, and Python, some Java, PHP, SQL, and JS (inc AJAX).
Rasberry Pi
Probably an average user.
Apple
iTunes and Genius (for iPod). Don't have a mac (but want one!).
Electronics
Basically, I have a model railway which I need to power. Nuff said.
LEGO
Mindstorms, Power Functions, Technic, and general building (especially small-scale).
Maths
General stuff, shape, 3D stuff, algorithmy stuff.
Programmers
Java for Android. Not alot else.
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Stack Overflow
Q&A for professional and enthusiast programmers
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
LEGO® Answers
Q&A for LEGO® and building block enthusiasts
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Mathematics
Q&A for people studying math at any level and professionals in related fields
Ask Different
Q&A for power users of Apple hardware and software
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Server Fault
Q&A for professional system and network administrators
Musical Practice & Performance
Q&A for musicians, students, and enthusiasts
Programmers
Q&A for professional programmers interested in conceptual questions about software development
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Photography
Q&A for professional, enthusiast and amateur photographers
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
User Experience
Q&A for user experience researchers and experts
Robotics
Q&A for professional robotic engineers, hobbyists, researchers and students
Graphic Design
Q&A for professional graphic designers and non-designers trying to do their own graphic design