Interesting article about pitching rates. I thought it was interesting that ester levels were pretty similar, while the underpitched beer had a lot more fusels and solvent character. The lacing and head retention difference was interesting also.
I've heard a lot of people say that underpitching Belgian beers results in more esters, but it would seem from this test that you'd be getting more hot alcohols and impairing fermentation performance, which was always my gut feeling on that.