The Personal Binder is where you store the kind of information that is hard to remember but too important not to. Think; your SIM card number, eyeglass prescription details, your kids' shoe sizes - All the minor, but pertinent things. 
And why not add important contact information as well? Think the phone number for your kid's dentist, school contacts or the doctor’s office. Sure, those numbers are in your contact book, but in CleverBinder they are organized according to the person related to the information.