While making my annual pilgrimage to the Miami Boat Show last week, I managed to grab a few minutes with Thom Dammrich, the president of the National Marine Manufacturers Association.  The great thing about folks like Thom is that they can put some hard numbers to perceptions we have about things like the health of the boating industry. While the Miami show is always glittering and glamorous, the impressions I had before strolling through the Miami Convention Center were mostly that boating was taking a whack from the souring economy. ...