Apple's official line is that you have to buy one copy for each computer you install it on. However, there's absolutely nothing preventing you from simply buying a single copy and installing it on as many Macs as you want.
If it bothers you to break Apple's terms of use, you can always buy a "family pack." The family pack was introduced with Jaguar. It's $199 and you get a five-computer license. But it's basically the same as the single-license package anyway. I don't think you get extra CDs.
It's up to you, really. The family pack is cheaper than even two separate copies of OS X, so it's not THAT much worse. But if you're low on money or something, you can get by just buying the standard box for $129.
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