However it's important to note that a standard buck-boost will invert the voltage... ie - 5 volts in, -5v out. so if you are using it with a battery or isolated (floating) source then you can often get away with it, but if you need a true + to + converter then you'll need a SEPIC or similar topology as others have mentioned.
oh, and hantto, thanks very much for posting that information/website.
as you may have noticed from my recently active thread, I'm trying to build a 12v output DC-DC for my car computer and having a working design to start from (or just use straight up...) is awesome.