@Lathais: No, it was fact that shadow bolt scales so extremely well with crit, haste and damage that it outdoes Curse of Agony in one cast than Curse of Agony would do in the same 3 seconds (taking into account travel time for Sbolt), with 3s being the downtime for CoA GCDs as opposed CoD.
Still, Faerie Fire is at least equal (if not better) armor reduction than Curse of Recklessness, and Demoralizing Shout/Roar has always been better than Curse of Weakness. Curse of Tongues is actually better situationally than other curses (a la Channelers for Magtheridon, and many trash mobs). Ebon Plaguebringer and Earth and Moon are passive talents that don't take up a DPS slot like Curse of the Elements (with or without Malediction). So, that leaves us with CoA and CoD.
With current talents, CoA seems to be better DPS because it has a much higher DPCT (despite the huge nerf to Amplify Curse), if I remember correctly. It is *definitely* better DPS for Destruction (and possibly Demo), as it lends to more Molten Core procs.
In any case, outside of raid and 5-man bosses, CoA > most other curses in almost every case, and has always been that way.
As far as spellstones vs. wizard oils, the Firestone would probably be better for Affliction/Demo for the crit bonus, and Spellstone for Destruction for the haste bonus. Probably a playstyle preference, though. In any case, they yield a tad more DPS than oils - and best of all, free.