sugarcube, there is another section on this site.....Special Threads & Exceptional Information. Kind of a gathering ground for any useful sites/references/contacts/whatever, so they don't get lost down the pages. Makes it easier to find those helpful bits when you need them.
As for KC's finding the date, if you check the link he supplied you'll see that it using the letters/numbers on the bottom of your piece you can trace it to a date or time frame. Thus another great addition for our Special Threads section.