Clickz:

"Think about it. Even if you're mailing to a permission-based opt-in rental list, the message you're sending -- to be absolutely precise -- is unsolicited. It hasn't been specifically requested. And it's certainly unexpected, unlike an e-newsletter you've signed up for and expect to receive regularly."

Straightforward account of an e-mailing campaign that turned weak results, and how they're trying to get better next time.