Destro raiding in Icecrown Citadel
First of all, in my experience in Icecrown Citadel is the wide variety of encounters you find yourself in. Give it up to Blizzard for finally making a raid that challenges you as both and individual and as a group. As a warlock my initial Spec was Destruction, and i still use destruction during some encounters. Unfortunately there are some encounters that call for you to be able to deal damage while also moving around. Obviously while destruction, you are casting direct damage spells that require you to stand in one spot while you spam spells that have over a 1.5 second cast time. Henceforth if you plan on using destruction as your primary raid spec, i would suggest haste, tons and tons of haste. My gem priority goes as follows. red sockets are for runed cardinaly rubies(23 spellpower), Reckless Ametrines(12 spellpower and 10 haste) and blue sockets as of right now are purified dreadstones(12 spellpower and 10 spirit), but in 3.3.3 your glyph of lifetap will get its bonus from spellpower and not your spirit so you will need to regem accordingly. But for those fights that you have to be constantly moving around while maintaining a high level of DPS, you will need an affliction offspec. In this spec your 2 most powerful spells are instant cast and they are also dots which means that even when you are running around not casting anything, they are still ticking away at about 3-6k damage every second or so depending on how much haste you have and wether or not you have the glyph of quick decay. Plus when the boss hits 25% health, you get to spam drain soul for anywhere from 6 to 15k crits per tick until the boss is dead while your haunt, corruption, curse of agony and unstable affliction are still dealing their damage, awesome spec for that 7 minute beserk timer on festergut. Plus your corruptions dot ticks become faster with your haste which means the same Spellpower haste, spirit priority on gems works for affliction as well as destro, so you can use the same 2 gear sets.