His blog can be found at http://www.xavierdecoster.com.
He's also a co-founder of http://www.myget.org (NuGet-as-a-Service).
Q&A for professional and enthusiast programmers
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 computer enthusiasts and power users
Q&A for people studying math at any level and professionals in related fields
Q&A for entrepreneurs looking to start or run a new business