Finding news and information online

Here are some of my favorite online news and information aggregators related to mathematics.

• math overflow & math stackexchange
• hacker news
• slashdot
• /r/math & related subreddits (see sidebar)

I keep track of these (and everything else I'm subscribed to) with google reader. When I find something interesting I can save it, tweet it, or blog about it.  It's an efficient and organized way to sort through tons of information.