This (with my modifications) just showed up in my mailbox.

It was good meeting with you at the SoCon08 Conference.  XXX is a sales performance agency – focusing on sales recruiting and sales training for businesses.  We are sending you separately our latest newsletter, “Driving Profit,” which we hope you will find beneficial.  We would like to speak with you if you feel your company would like to increase its sales productivity.

This crap went to about 260 people.  Taking a social media nonconference attendee list and turning into a spam mailing shows an unbelievable disregard for not only everything that SoCon represented but the norms of Internet etiquette.

Don’t do this.  Never ever.