I have a subscription to Rider Magazine (one of the better "all brands" magazines out there, IMHO), and in the January '07 issue they have an article on BMW's motorcycle assembly plant in Spandau, Germany (which is near Berlin, I believe). Good article, too! (Especially the part about hand painting the striping on the gas tanks!) Pick up the issue and read the article, if you have the chance.
(PS....The subscription price of only $12 a year is a real bargain, too, and features a monthly column by Clement Salvadori, who, along with Peter Egan of Cycle World are two of the best writers in the business.)