The architecture of Open Source projects : Pick some of the top open source projects around, and let the lead developers write about their design and architectural concepts and models. Amazingly good stuff.
Fuel PHP Framework : Fuel is a simple, flexible, community driven PHP 5.3 web framework based on the best ideas of other frameworks with a fresh start.
ID Policy : The OBO foundry documentation on identification management, and interesting tack even though I don't agree completely.
Understanding JQuery UI widgets : a tutorial.
Best Linux multimedia applications : "Today's category is multimedia applications. This is a pretty broad one - photo organisers, audio and video editors, drum machines, podcatchers, synthesisers and most anything else related - so if you think it counts, it probably does!"
Schema.org : The rest of the universe has waffled on the news of this site launching. I found their data model page the most interesting.
Gephi.org : "Gephi is an interactive visualization and exploration platform for all kinds of networks and complex systems, dynamic and hierarchical graphs. Runs on Windows, Linux and Mac OS X. Gephi is open-source and free." Looks fantastic!
PHP-classes : Just an interesting collection of useful PHP classes (or, more specifically, functions, but who's counting?)
Science and mixed bag
Latest earthquakes around the world : Brilliant resource for those of us who follow the crusts till the end of the world!
Evolution : Perhaps the best resource I've seen yet about evolution; massive, extensive, thorough, clear, and recommended.
Photo.stockexchange.com : "I was thinking at the differences between SLR and DLSR (in Manual mode). In both cases you can change aperture and shutter speed as it suits you. But with SLR you are stuck with the ISO of the film which you happen to have in the camera at the moment, while with DSLR you can vary ISO as you wish, too. Now maybe the question is naive, but how is this handled in practice?" Perhaps more than you ever wanted to know.
Roger Ebert's two-thumbs up : The latest line of movies deemed good by perhaps the worlds best movie reviewer (and by best, I mean smart, thorough, sharp, well-rounded and honest and spot on after all these years I've read his stuff. This guy thinks about movies the exact way I do).
Philosophy and religion
Something rather than nothing : The Unpublishable Philosopher keeps bringing the goods! I want to follow this one up in the future, it's really good stuff.
A taxonomy of fallacy : As brilliant as the title sounds.
Thomas Hobbes : "Thomas Hobbes of Malmesbury (5 April 1588 – 4 December 1679), in some older texts Thomas Hobbs of Malmsbury, was an English philosopher, best known today for his work on political philosophy. His 1651 book Leviathan established the foundation for most of Western political philosophy from the perspective of social contract theory"
Gettier problem : One of the more interesting problems of epistemology.
Atheism Is the True Embrace of Reality : The brilliant Paula Kirby writes; "Until 2003 I was a devout Christian. And I mean devout. I believed absolutely, and my faith was central to my life at that time. Various clergy thought I had a calling to “the ministry”; one even suggested I might have a vocation to be a nun. Now I am an atheist: the kind of atheist who is predictably referred to by religious apologists as “outspoken” or “militant.” So what happened? What happened was four little words: 'How do I know?' "
Philosophical Ignorance : What happens when a theology-based Calvinist proclaims that a statement of reason needs splitting hairs in order to complement his world view. I have my own follow-up at Sheltered Objections.
Historical Jesus : Jutified true beliefs? Epistemologically interesting take on the historicity of Jesus that must be taken seriously by believers for the rest of us to accept your claims as anything more than mere opinion.