I'm registered for the OMMA conference in New York right now. They are supposed to be an industry leader and are breaking one of the biggest rules of permission marketing - don't abuse the user. Since yesterday morning I have received a total of 7 emails from them - although I hit unsubscribe after the second.
Yes, according to CAN SPAM they're ok because they have a few days to take me off the list - but it's highly annoying and I don't want any of it.
Play by your own rules, OMMA!