Primarily develop in C#
Use ReSharper and am a big fan of the product.
Spend a vast amount of time lurking on StackOverflow...
Q&A for professional and enthusiast programmers
Q&A for computer enthusiasts and power users
Q&A for scientific skepticism
Q&A for linguists, etymologists, and serious English language enthusiasts
Q&A for professional programmers interested in conceptual questions about software development
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Q&A for apps, scripts, and development with the Stack Exchange API
Q&A for professional system and network administrators