My favorite was the one where I got flown out to the Bay Area for an interview at Apigee. They dropped the ball by not having everybody there to interview me, meaning they couldn't get all the information about me they would have liked. When I left, it was all roses (including a said follow-up comment like above), and then complete and total silence. I get you may not think I'm right for the job, but flying somewhere takes a lot of my own, personal time.
1. I'm naming names for two reasons: one, I, like the author, think it's deplorable. More importantly, if you are going to take a potential employee's time without the courtesy of a simple reply to one of multiple questioning emails by saying, at least, "No, thanks", others deserve to know what to expect as well. I couldn't even get a response on how to get reimbursed for incidental travel costs without tracking down somebody outside of HR.
2. I don't think this had any impact on their decision to ignore me. It didn't even concern me, but, taken with the other events, it points to a lack of respect for candidates.