Darren Rowse (the Problogger guy, but you already knew that) has compiled a nice list of books bloggers should or could read. As usual he’s telling his readers to contribute so you should.
Some of the suggestions will actually end up at my place at some point or another. And I will of course credit Darren for his work by clicking his Amazon links.
If you don’t want to go the long hard way of reading you could always check out Christian Montoya’s ten ways to make your blog ugly – and just do the opposite. Then again, if you follow his advice you won’t make any money but that’s a completely different matter.

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“Then again, if you follow his advice you won’t make any money…”
Tell me about it :/