slashdot.org - as already said, great tech articles, and TONS of comments on the articles. As xSauronx says, if you feel like reading through the comments, they can be interesting, and occasionally give information that is accurate. Don't count on the modding system for the comments though, anybody with any intelligence usually gets modded down, or not at all. Mindless rants or false/stupid information are about the only things that make it to +5 on the modding [/rant].
wired.com - great tech news site, but almost never linux-specific, or even pc-specific for that matter
linuxjournal.com - it's got blogs, news (interesting news usually makes it to Slashdot first, though), how-tos, and articles. The site layout makes it a pain to quickly see what is new though.
linux.com - probably my favorite after Slashdot
linux-mag.com - good articles, occassionally updated (weekly, I think), but it's layout makes it a mess to see what's new.
tuxmagazine.com - interesting articles, but hasn't been updated since 2007