On: Ask YC: Your best programming websites/blogs

http://anarchaia.org/

http://blogs.azulsystems.com/cliff/ (JVM hacking, concurrency, non-blocking hashtable)

http://osteele.com/ (javascript, functional programming)

http://glinden.blogspot.com/ (personalization, collective intelligence)

http://paulbuchheit.blogspot.com/

http://steve-yegge.blogspot.com/