The Economist, Deal Book, front page of the WSJ, Inc., Bloomberg, EE Times, and Wired. Or a representative sampling of them all ... Frankly, my best software sources are friends at local, public software companies like Mentor Graphics, Symantec, and Jive. Buy them a beer and give them an hour. And take notes.
Since the impending doom of Google Reader, I have been using feedly as my main reader. There is an excellent discovery portion based on topics. This allows me to aggregate all my blog reading and special content into one place. It is a good way to follow tends and scan popular sites. Having little time to look at all the sites individually, it is a great time saver also. I also use Pocket to store longer articles or ones I want to reference later.
Great question. Very interesting to see the results so far.
I treat Slashdot as my primary source of tech/nerd news. I also have Ars and a few others but I mostly ignore them, finding that Slashdot will cover anything in those that I'm interested in.
I also follow some privacy-centric or legal blogs (EFF, Canadian Privacy Law Blog, Michael Geist, Office of the Privacy Commissioner, etc.) because a topic that makes it to those blogs is also usually highly relevant (but often missed on slashdot)
For specific technologies I use (jQuery mobile, Google, etc.) I subscribe directly to the source.
For national news and keeping up with pop culture, it's The Toronto Star or The National, and I also like to check out The Guardian for Europe/pop culture stuff.