Filtering out press release spam
This may become useful. I've actually gotten so annoyed at organizations that insist on sending at least one marketing email per day that I had to unsubscribe from all of their mailings to get some peace of mind. Restoration Hardware, America's Test Kitchen, Costco are three of the big offenders that drive me crazy.
How to filter out press releases from your email - Boing Boing
If you get too many press releases emailed to you, try Merlin Mann's trick of creating a filter that diverts or deletes emails containing the string "For Immediate Release." I just found 11,000 messages in my mail with that string in it.