Help with my 29s buildFollow

5- Imp. Corruption
5- Imp. Shadow Bolt
5- Bane
4- Aftermath
1- Shadow Burn

That's what I'd recommend.

Start with Succy's Sedution, throw on CoA, Corruption, and Immolate if you have time. Then Fear, spam Shadow Bolt as much as possible and Searing Pain when they are close. Leave Shadowburn as a last resort, or when you know it will kill them.

Hope it helps.

Really depends on what your using the build for. Are you doing BGs at 29, if so than the above advice is probably ok. I'd go with this though:
http://wowhead.com/?talent=IVZ0LZxx0z

Gives you Instant Cast Corr, for casting on the run, and Demonic Embrace for more Sta. Sta is the most important stat in PvP at this level.

If it's for PvE, Soloing and Instancing, you'd probably be better off with a Drain Tanking or Drain Hunting build. I'd go with something like this:
http://wowhead.com/?talent=IVMrVRo

Still gives you Instant Cast Corr, Better Drains and Better range on your DoTs. If your not Drain Hunting, you can probably lose Imp Drain Soul, but the 10% Threat Reduction will help your Voidy hold aggro. If you not Drain Tanking, Fel Concentration isn't as important, but still nice for those "Oh ****!!," moments.

8% chance to stun
4% added chance to crit
12% more hp

With 8% chance to stun, you still have the 5% crit but also the 8% chance to stun, giving you time for 1-2 Shadow Bolts while not killing your chance to crit. Really useful against those damn Rogue twinks running around like a kid hyped up on sugar. Especially useful withing groups running around BG's, just stand in the back with the chance to stun for easier kills.

Normally with a Warlock you usually have 5% natural crit chance unless you really build for it, so if youre gonna go more with a Stamina build you will have between 9-10% chance to crit. If you are worried that you will run out of mp (and thats the reason you want more bang for your buck) you have Life Tap, it is really useful. If you want this to really help you I would gear for at least 15% chance to crit to really make it shine.

Most of the time in WSG or AB, your not gonna be running into battle like a Warrior. Unless you want to wade into the fray and chain cast fear and DOT's hoping you wont get targeted by a Hunter, Shaman or maybe a Rogue that will sap you. Mage's can be a pain to since they can Sheep, also Warlocks for Fear. Believe me, after one encounter with a Fear spamming Warlock... you will be targeted first lol.

Which brings me up to another matter, for PVP the best alliance for warlock is Gnome and Undead for Horde, they have the most useful Racials for PVP imo.