I read all the web design NL's & get WEBSITE Magazine. I keep up with all the technical and non-technical advice generated in Nl's & forums. I also look at websites at random to see if design is good and meta tags have been done right. Sometimes I email site owners they need to fix something & then tell them how to do it.
Too many to list; over two hundred. A few that stand out are Gigaom, TechCrunch, LifeHacker, Gizmodo, Smashing Magazine, CSS-Tricks, Tuts+, DesignShack, the WordPress blog / tracker.
I keep up to date with our technology through: Digital Sigange Today
I Love Twit.tv Leo and the gang are awesome and are always on top of the latest and greatest news
Informationweek, eWEEK, InfoWorld, Dr. Dobb's Journal, Computerworld, Wired, NY Times, WSJ, Businessweek - those are mainstays.
I don't read magazines or websites on a regular basis. But when people I respect send me links to items they think I would get something out of, I read them. Some I can think of that I've read lately: makezine.com , hackaday.com , gizmodo.com , boingboing.com . I also still get MAKE Magazine and 2600 Magazine (and when I have time to read them, I enjoy what I read).
twitter.com, talk2myshirt.com, fashioningtech.com, plus I keep my ears and eyes wide open
Twitter, google, apple, Flipboard
Confess that I don't use these things much and rely more on one to one briefings and discussions. I do check BBC news everyday though.
PCmag, FB, Twitter, Ubuntu Forums, and some more...