For fun I play guitar (acoustic and electric), build LEGO robots, tweak http://reiber.org and make random contributions all over the internet - see: http://bit.ly/reiber which just scratches the surface.
Q&A for computer enthusiasts and power users
Q&A for professional and enthusiast programmers
Q&A for professional programmers interested in conceptual questions about software development
Q&A for Ubuntu users and developers
Q&A for professional system and network administrators
Q&A for linguists, etymologists, and serious English language enthusiasts
Q&A for LEGO® and building block enthusiasts
Q&A for power users of web applications
Q&A for user experience researchers and experts
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 pro webmasters
Q&A for peer programmer code reviews