Here they are:
NASA blogs – daily updates from NASA
sciencemag.org – Science news from Science
artemvovkguitar.com – a blog run by Artem Vovk – a wonderful guitar player, photographer and explorer
scienceblogs.com – a very interesting science blog run by Coturnix
writing.upenn.edu/~afilreis/88/home.html – a web site dedicated to the modern English poetry
OpenCulture – the best free science, cultural and educational media on the web
ericvalli.com – the most beautiful pictures from Eric Valli.
spiekermann.com – the Erik Spiekermann’s (the famous typographer) blog
Erik Spiekerman on DesignMind – legendary type designer Erik Spiekermann talks type with frog, expounding on the beauty – and the difficulty – of designing numbers
The Common Parlance – An erudite discussion about the proper usage of words in the English language. I found it very helpful
cssZenGarden – a beautiful demonstration of what can be accomplished visually through CSS-based design
alistapart.com – the most valuable resource for web designers
I promise to update and expand this list.