I'm a scientist by training, a software developer by choice, and an IT generalist by way of over 15 years' experience in various IT-related endeavors.
I'm partial to Java, XML and Linux (mostly Red Hat-flavored).
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
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Server Fault
Q&A for professional system and network administrators
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Personal Finance & Money
Q&A for people who want to be financially literate