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Don't get me wrong, they might be worth checking out if you're just into SF and looking for some light reading. It's been a while, I might go back to them if I want to turn my brain off for a while. Could be because I read it roughly at the same time as TC&TC, but I seem to remember Neil Stephenson's Anathem as being somewhere along the same lines of brain-fuckery. You have to get over his writing sometimes, which draws a lot of attention to its own cleverness, but it was pretty enjoyable and marginally thinky.