I found out about this site called CatalogChoice.org who is trying to make it easier to opt out of receiving catalogs in the mail. According to them more than 19 BILLION catalogs are mailed out each year. I know that I rarely want the catalogs I get in the mail. Some companiese are particularly agressive and send a new catalog every 2 weeks. I even get catalogs for about 6 previous tenants.
If you are getting catalogs you don't want here's a very simple way to cancel them.