http://talent.mmo-champion.com/?sham...00000000000000
For me it's best ele raiding spec for wotlk atm, you don't need Reverberation, because only shock you'll use is Flame Shock for Lava Burst crits, also for Raiding you wint need Eye of the storm, because there are not so many encounters when you'll suffer from pushbacks.
FOR SURE you'll need Elemental Precision 3/3, and Shamanistic Focus will benefit when you put 1 point in it (why not, you are already on t3 in enh tree).
Optional: i don't really know how will ele shaman look with mana usage in wotlk, if it will be weak you can remove 2-3 points from Ancestral Knowledge and get 5/5 Unrelenting Storm (AK is really weak talent, so you can remove those 3 points easily).
Also, if for any reason you'll need Eye of the storm in any encounters you can get it 3/3 by removing 3 points from AK, or put those 3 points in Astral Shift if there will be many encounters Archimonde-alike.
Improved Shields are useless unless you raiding experience will show that there is lots of aoe fights and you mana management is poor.