Funny thing is, PS/2 is generally regarded as a better interface for keyboards. Interrupt-based (not polled), most PS/2 boards with full NKRO aren't limited to 6 keys + modifiers, that sort of thing. Except these days, it's actually more expensive to implement than USB from what I've heard, so they're omitting it.
Fortunately, all the reasonably feature-rich motherboards I've seen these days still sport at least one PS/2 port, and if even that ceases to be, there's plenty of PS/2-to-USB adapters floating around, particularly these "Blue Cube" adapters the other Geekhackers are fond of because they work with IBM Model Ms.