General Knowledge-
Wikipedia-
How Stuff Works-
TED-
Wolfram Alpha - Knowledge exploration/visualisation.
Our topic on the language behind itScience & Technology-
Slashdot - SciTech news & discussion
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Fudzilla- SciTech news
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Ars Technica - SciTech news
To do: add hardware hacking guidesOnline Courses/MOOC-
Khan Academy-
edX - Harvard & MIT run
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CourseraObviously this list can be massively expanded. I'll work on it a bit but it would be good to hear about other websites/channels/other sources folk use.