Nono, let's teach everyone how to lock.
UA Raiding/Farming/Arena spec - This build is rather universal, as it will do all 3 rather efficiently. You will realize that all the builds I use/make are based around PvPing and PvE alike, so that I don't have to spend another 40g to respec everytime I change what I'm doing.
Fire lock build Yerp, I used to be a fire lock
It's amazing DPS in 5-mans and it's fun to use in BG's, but as far as raiding goes, I feel sorry for your healer for all the life tapping you will be doing, and as far as farming, forget it.
SL/Ruin This build was shown to me by another warlock in my guild, but I changed around some things to fit my playstyle. This is probably one of the higher DPS builds for 10/25 man raiding, and is also the easiest to run. Shadow bolt shadow bolt shadow bolt that's all she wrote.