Ohh, your tutorial was just great! You're right, they are so addictive. I make these in a couple different sizes and variations as business card holders, bigger as coupon caddies and with a ribbon/keyring attached as ID holders. They are so handy for everything, and also make great gift card holders (much classier than a paper envelope!).
Once you start, ya can't stop!!
Since I haven't posted 10 times yet, I can only post links, here they are if you're interested!