Ask HN: Good books on mathematics for somebody who's only taken high school math?

I was just reading Lockhart's Lament again (http://www.maa.org/devlin/LockhartsLament.pdf, if you haven't read and reread it yet), and I got a tremendous urge to really start getting into math. Problem is, I don't know where to begin with it. So I figured I'd ask: what books out there discuss math in the same way Lockhart does? I don't want a drab textbook: I want something that makes math as fascinating as it was in middle school, when I actually had fun learning about this stuff. Something that really is ecstatic about math.<p>I remember having a book about Fibonacci that was like that, but it was a pretty small book. Just as an aside.<p>And, if you don't have a good math book (though that's what I'm looking for), are there any books you've read that inspire that same sort of ecstasy in you? Personally, I've found myself inspired both by Bill Bryson's A Short History of Nearly Everything, along with Malcolm Gladwell's The Tipping Point. (Even though the latter wasn't exactly a scientific book like it purports itself to be, I was still fascinated by the concept it discussed.) Anything else?