Yahoo Finance: I started using this a long time ago, when I bought my first few shares on the stock market in 2001. I retain only Priceline.com and was foolish not to take a significant position. Anyway I was (am?) still learning.
Seeking Alpha: Really a anthology of random blogs. It is funny these days I turn to blogs and the comments section of mainstream media articles for more nuanced information (financial or political).
Investopedia: Lots of fundas, written legibly. It also has a nice collection of articles on recent happenings, but like I said - it is best for knowledge, not information.
wikinvest: Wikipedia's little brother. I like the relatively clean interface (not as advertizementless as wikipedia), and contains fairly good information on liquid stocks.
gurufocus: Good place to see what investors I admire are up to.
Motley Fool: Used to be a vastly superior site. Now it reeks of commercialism. They want to sell you something every step of the way. But still, CAPS is a good filter for good ideas.