I'm an Australian software engineer developing webapps for both .NET platform (SqlServer, NHibernate, MVC, ASP.NET) and JEE (Oracle, Hibernate, JSF/RichFaces).
Having followed Spolsky and Atwood's podcasts from when Stack Overflow (and the entire Stack Exchange) was just a twinkle in their eyes, I'm truly impressed at just how well it works. In time, we'll realise just how revolutionary Stack Overflow is/was.
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Writers
Q&A for authors, editors, reviewers, professional writers, and aspiring writers
Biology
Q&A for biology researchers, academics, and students
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Physics
Q&A for active researchers, academics and students of physics
Russian Language & Usage
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Russian language
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Chemistry
Q&A for scientists, academics, teachers and students
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Server Fault
Q&A for professional system and network administrators