By virtually any statistic, drupa, the printing industry’s largest trade fair, is a staggering undertaking. At Messe Düsseldorf is hosting drupa 2008. the last drupa in 2004, 394,478 visitors from 122 nations attended the two-week exhibition, visiting 1,866 exhibitors from 52 countries.     With that in mind, it’s more than understandable that drupa is held every four years.     This year’s drupa, scheduled from May 29 through June 11, promises to be another gigantic pro...