I don't want to speak for patio11 or anyone else, but "meeting over a cup of coffee" shouldn't be thought of as "a way to get a good job", at least directly. It's not a replacement for the interview process, anyway, at least at any place of employment that won't fit into a single meeting room. Instead, it's (a) a social occasion where you can (at least pretend) to (b) learn about the employer or industry. (b) is as in, "what would I need to learn or do to be an interesting employment prospect".

For (a), an introduction from someone you mutually know would be best, but theoretically, a cold-call to the tune of, "I would like to know more about X and Y, would you have a few minutes to talk to me," would be appropriate.