I have made the mistake of buying a pattern I liked twice. (I guess I REALLY liked it!) It's such a waste of money! To prevent that from happening again I made a list in Word on my computer of all my books and supplies. My books are listed by author's last name. Patterns are listed alphabetically by title. Magazines are listed by name with the month and year after it. Embroidery CDs are listed by title. I even have my rulers listed by size and my machine feet listed by number. This may sound compulsive but it has saved me money by preventing duplication. My deal with myself is that if I buy it, I have to go to the computer and enter it before I read or use it. Once every month or two I print out my updated list and keep it in my purse. Anybody else do this?