You can buy a set of mailing labels which is updated daily as information comes in. Most days the editor receives information about a new circle, change of contact details or closure. So the set of labels you order will always be up-to-date.
The labels are printed in categories - circles, courses, workshops etc. - to help you tailor your mailshot. There are usually around 1,000 labels but this, of course, varies due to new information received each week. The editor can easily do a count for you if you write or phone.
In addition, there are an increasing number of contacts who provide no mailing address but like to be contacted via their website and you are provided with this list when you purchase the labels. (Feb 2007 - approximately 80 of these.)
(In comparison, the print Directory is renewed twice a year and provided with an amendment sheet so that you receive the new information received weekly which is mentioned above.)