Britain's secret little post office at Bletchley Park has a new web site for its little pieces of art and history. Since 1994 it has been telling the secret history of Bletchley Park through a combination of exclusive artwork and postage stamps. Web visitors can now browse the 15 categories more easily. Many of these first day covers have become worth many times their original issue price. Some purchased for only a few pounds now change hands for hundreds on auction sites such as ebay. The collection as well as historical information can be seen at bletchleycovers.com.