If you are interested in the history of playing cards you might find the following 3 links to be a good read!
I conducted a forum search before listing these and only found a History of Magic (check it out if you haven't already) post. So, please forgive me if I missed something and these have been posted before.
This link was listed in the History of Magic post. I relist it here in the card section in case it was missed.
It's very interesting and enjoyable to know a bit about those little things we become so intimate with.