Took on more of Cheri's recommendations, changed the example colors to be more NIRD-like, and cleaned up the extra files a bit.
Changed row logic to eliminate air gap entirely. The only disadvantage I can think of is that non-floated content that isn't being positioned using the NIRDgrid will need to be protected with a clearfix.
Eliminated references to the air gap, since it was generated by the old display: inline-block hack on the rows.
Got overzealous with deletions, needed to add rows back in.
Incorporated the rest of Cheri's recommendations, except for a better ending paragraph.