Export Address Book is an application which exports all the data in your Address Book into a data file. Even fields with self-defined labels are recognized. You can choose between various export formats, like TSV, CSV, HTML table and vCard (in Address Book, you cannot specify which fields to export when you create a vCard - in Export Address Book, you can).
You are able to select which contacts to export, which fields from those contacts and how to order them. For later reuse, you can save all of that as a template. With the built-in Automator action, you can automate exports.
UT86COLT This is a great program that works without any glitches. I had requested the group export feature and the author emailed me a revised version within 24 hours. I use it every week to export custom versions of my address book. (Version 1.3.1)