Here are the ones in my reader, admittedly I haven't visited often enough over the past couple of months:

http://www.igvita.com/

http://ejohn.org/

http://codingrelic.geekhold.com/ (Denny covers assembly and networking issues often in great detail)

http://buhrmi.tumblr.com/

http://elegantcode.com/

http://72lions.com/

http://kellabyte.com/ (mobile-ish dev)

http://lambda-the-ultimate.org/

http://ihumanable.com/blog

http://4loc.wordpress.com/

http://www.maxogden.com/

http://till.klampaeckel.de/blog/

http://www.quirkey.com/blog

http://www.mikealrogers.com/

http://cocoawithlove.com/