Competitive Placement Combines Contextual Oddity
Now here's some contextual advertising double stuff for you. In an article about email and telemarketing touting their superiority over snail mail, not one but two snail mail carrier ads appear on the page: USPS and UPS. Not that there's necessarily anything wrong with an ad appearing next to a story that praises the opposite of what it does but there might be some competitive issues with the ads for competing services appear next to each other. You decide.