For now, just some commendable efforts;
some sources of world knowledge:

Perry Bible Fellowship (comic strip)
XKCD (comic strip)
explodingdog (I'm... not sure)
Dinosaur Comics (legendary comic strip)
A Softer World (comic strip)
Sid and Lasker (comic strip - on hiatus)
Indexed (web strip, not exactly a comic)
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http://www.theonion.com (THE onion)
Nice cartoon tutorial