Warlock Set Swaps
The most important set swap for Warlock is the thor's jewels. It allows for a faster inferno cooldown, however Warlock doesn't have the added cooldown reduction from their tainted set like wizard does, so it isn't the same 5 second inferno.
Another swap Warlocks can use is shackle set (95) for chain cast cooldown. You can use this for a few different things, but an extra ice field during big groups of mobs helps a lot if there isnt a reaper or spectre nearby.