By Lenn Thompson, Executive Editor While some argue that it's vitally important for emerging regions to identify and focus on a 'signature variety' I think it's more important for any region to take its time, experiment and let the evolution toward specialization happen organically — if at all. Without the type of experimentation and open-mindedness we might not get to enjoy wines like the newly released Palmer Vineyards 2010 Albarino ($25 for 500ml). This is Long Island's first Albarino, from the first fruit harvested off of a single acre of vines, and it's no real surprise that it's made by…