I finished Superfreakonomics last weekend. I liked the first one and the second one is much the same, maybe going into a little bit more detail than the first one in some ways. A collection of weird factoids with the overlying theme that common sense is fallible and people don't always act rationally. If only my economics textbook had been written by these guys, I might have actually cared for that class in college!
I'm only about 20 pages away from finishing the The Diamond Age. I'm enjoying it much more than Snow Crash. More on both later.