Tech

http://highscalability.com/

Security

https://www.schneier.com/

Astronomy

http://scienceblogs.com/startswithabang/

Art

http://www.thisiscolossal.com/

http://www.demilked.com/

DJ Stuff

http://www.djtechtools.com/

Ranting Lawyers

http://popehat.com/

Comics

https://xkcd.com/

http://www.businesscat.happyjar.com/

http://questionablecontent.net/