I'd already decided to do the e-mail unsubscribe thing before I saw this, so I'm definitely in :-) I immediately discovered that the junk email I'd been getting from 1-800-CONTACTS was because someone fat-fingered an e-mail address and when I tried to unsubscribe I discovered I had access to their account with phone, full name, snail mail address, prescriptions, last 4 digits of the credit card, etc. Yikes. Contacted the company and got it sorted out. They were very thankful.
I don't get very many snail-mail catalogs - most of the ones I do get are for a person who lived here before - could I still cancel them via that catalog choice site if they're not for me?