This is a really awesome thread from the official Blizzard Warlock forums. It was so good it was made sticky. It answers lots of really good questions, the author is very well spoken and lays everything you probably ever need to know about Warlock PVP out, in a well organized post. He comments on the feedback from subsequent posts as well.
then copy and paste the url from my op into the search field and click "Hide My Ass."
It will take you to the site but disguise it and will allow you to get through most proxies if you are willing to deal with a few retarded advert banners.