@Jas2davir: You don't have to use /stopcasts on live anymore. I have tested it, I'm so glad they finally added this in since /stopcasting macros can sometimes cause your cast to end prematurely if you receive a small spike, but Blizz's version only casts after your previous cast ends.

As Quazacolt stated, watch Azazael's vid, he's one of the best locks I've seen in a while. Fought him in BGs before too, it was not fun. While just DoTing everyone you see can rake up kills pretty easily, I would highly recommend you learn to manage your pet well, especially if it is a felguard or felhunter. For arenas, i don't think any warlock uses a succy. While leaving spell lock and devour magic on autocast is ok when fighting bad players, it will help you a lot more if you save them for specific instances, like interrupting a heal or dispeling HoJ from yourself (as an example).

Well played warlocks are hard to come by, but those can really rip people apart. Good luck with your warlock.