http://www.youtube.com/watch?v=GwQMnpUsj8I
Ramanujan's formula for Pi:
Ramanujan and his formula
Khan Academy:
http://www.khanacademy.org/
Wikipedia:
http://www.wikipedia.com/
YouTube:
http://www.youtube.com/
Math-blog:
http://math-blog.com/
TED:
http://www.ted.com/
Sixty Symbols:
http://www.sixtysymbols.com/
Netlogo simulation software:
http://ccl.northwestern.edu/netlogo/index.shtml
Free software that makes math assignments:
http://www.kutasoftware.com/
Do it yourself website for people who like to build things:
http://www.instructables.com/
The first of many great Harvard lectures on the philosophy of Justice:
http://www.youtube.com/watch?v=kBdfcR-8hEY&feature=spotlight
Paul's Online Math Notes:
http://tutorial.math.lamar.edu/
Darwinian theory of beauty:
http://www.youtube.com/watch?v=PktUzdnBqWI&feature=related
Marco Tempest: Augmented reality, techno-magic:
http://www.ted.com/talks/
Limits of understanding part 1:
http://www.youtube.com/watch?NR=1&v=XF4eWsvYvxM
more to come...