Looking at http://www.societyofrobots.com/schematics_h-bridgedes.shtml
and seeing that the top two MOSFETs are supposed to be P-channel and the bttom two N-channel, if A were pulled high and B pulled low, wouldn't the top-right MOSFET open up because B is low and is P-channel, and then the bottom-right open up because A is high and N-channel? Thus causing a short circuit? Looking around, I typically see A on one side -- the left -- and B on the other, such that if A and B are high, then the circuit still does nothing just as if both were low.
Besides the note you should "Use PNP transistors for the top two MOSFETs, and NPN MOSFETs for the bottom two (the ones connected to ground). Otherwise bad stuff could happen," it looks like the schematic would work if only N-channel MOSFETs were used, such that the behavior would be as described in the article.
Could I do that and expect it to work fine? I have IRLU3802 N-Channel MOSFETs and only need to move 1.5A at 5V.