About books/literature:
The Literary Saloon
This is the blog section of the web's arguably finest literature review site,
The Complete Review. Tends to favor articles about non-English literature.
Grumpy Old Bookman
One man's musings about literature and being published. He has a good mixture of posts about publishing (which I usually skip) and ones about literature. His tastes are generally what people call low-brow, but very unapologetically so, and he says a lot of interesting things both about specific books and about literature in general.
Blog of a Bookslut
The blog section of the Bookslut site, and admittedly the only part I read. This favors pop culture and so is a good place to get a lot of random information about books of varying popularity. Essentially a daily dump of links to articles in other magazines and sites. It's a bit more cheeky than I usually like, but a good source for loads of info. Some other nice blogs in the same vein include
Maud Newton and
Bookninja.
Arin i Asolde
This is a Fantasy writer's blog that I've only recently discovered, so I don't know it very well. I'm not very fond of Fantasy, but she writes a lot of lengthy and interesting posts about various aspects of writing novels. Don't let the short entries on the front page fool ya, when you click their links to see the full articles, they're almost invariably huge.
I'd link more literature blogs, but I think it's easier for people to visit a couple of these and then follow their links to other blogs (I think all of them have lists of links down one side of the page)
For the programmers/fellow nerds,
The Daily WTF is classic.
The discussions are usually pretty lame, but the posts themselves are quite fun.
The site's raison d'etre is code-snippets found in programs people are working on. There are some truly mind-bogglingly weird and stupid programmers out there
There are some exceptions that are fun for non-programmers as well though (like today's entry, actually)