I like the idea of a split keyboard, but I've never been able to go down that road because I sometimes hit keys with the "wrong" finger - most notably, I need to be able to hit B with my right hand because it's down-left in roguelikes (i.e. Nethack). What I'd love to see is a "106% keyboard", where a couple columns are duplicated on both the left/right side. Does anybody make such a keyboard?
For Nethack and games in general, I have a cheap 'normal' keyboard.