There are many good "meta-pages" -- huge collections of links chosen by one or more experts, often with short comments or descriptions. The ones I use most often are:
Artnet.com Magazine -- With it's barrage of photo- and gossip-filled "Letters from [London, Rome, Paris, Venice, New York, Athens, etc.]," Artnet.com's online magazine has become so useful and so alive that it must be
described as essential reading for anyone working in the visual arts.
Notebook -- a very unusual site. It looks like it's meant to be private -- a labor of love, or obsession, created as a personal reference-tool. Yet the name of the site's creator isn't revealed. Its internal linking is haphazard, so it's hard to know exactly what's there. What makes this site worth visiting anyway are the long and uncommon texts - entire books in some cases, e.g. How to Care for Works of Art on Paper by Francis Dolloff and Roy Perkinson; part of John Ruskin's The Elements of Drawing (1857); etc.
Tracey - an online focus for contemporary drawing, maintained by Jane Tormey at Loughborough University's School of Art and Design in England. There is almost nothing here about history, collecting or the art market. They view drawing as a tool for thinking and analysis.
Umelec (Artist) -- great international magazine based here in Prague.
a node for Jack Burnham -- my attempt to provide access to the writing and ideas of this great theorist.
- Link established between string theory and gauge theory - "Princeton physicists connect string theory with established physics," Princeton University press release, 1 May 2007.
- "'Exact uncertainty' brought to quantum world," by Eugenie Samuel, New Scientist, 27 April 2002: "...The result is an expression that looks like Heisenberg's original relation, but gives the exact uncertainty in the measurements of position and momentum. [Michael] Hall says it is an equation rather than an inequality, which is 'a far stronger relation'. So strong, in fact, that in a paper published this month in Journal of Physics A, Hall and Marcel Reginatto of the Physical-Technical Institute in Braunschweig, Germany, have managed to derive the basics of quantum mechanics from it, including the Schrödinger equation that describes the behaviour of quantum-mechanical wave functions..."
- "Quantum experiment shows how time 'emerges' from entanglement," The Physics arXiv Blog at Medium.com, 23 October 2013
- "The origin of life and the hidden role of quantum criticality," The Physics arXiv Blog at Medium.com, 6 March 2015: "most biomolecules are quantum critical conductors; their electronic properties are precisely tuned to the transition point between a metal and an insulator... These findings suggest an entirely new and universal mechanism of conductance in biology very different from the one used in electrical circuits..."
- Nuclear energy levels seem to match a new formula to calculate primes - "Prime Numbers Get Hitched," by Marcus du Sautoy, SEED magazine, 27 March 2006.
- First 3-D map of the Universe's dark matter scaffolding - European Space Agency, 7 January 2007
- "The Known Universe" - a zoom from the Himalayas out to the edge of the known universe and back again, created by the American Museum of Natural History and the Rubin Museum of Art.
- Principia Cybernetica
- "The AI Manifesto: Internet SuperMind and Beyond" by Ben Goertzel and Stephan Vladimir Bugaj
- Astrobiology at NASA
- Best images from the Hubble Space Telescope
- The Search for ExtraSolar Planets
- SETI Institute
- arXiv.org -- significant new papers in the physical sciences
- "Solving Einstein's Equations on Supercomputers" - from IEEE's Computer magazine.
- Drew Berry's computer graphic animations of DNA, RNA and protein synthesis.
- Articles by Michio Kaku and John Gribbin
- Guy Debord's Society of the Spectacle
- Flemming Funch's "Whole Systems" webpage
- eHow -- "step-by-step instructions on how to do just about anything..."
- The Car Repair FAQ.