Upon dipping into the Wrath beta for the first time about a month ago, I quickly realized being a Resto Shammy wasn't going to cut it for leveling from 70-80 (don't worry too much, though, dedicated Restos, as that says more about my lack of patience for the spec than the actual strength of the spec itself). I switched Elemental the first time I got in there, and haven't looked back since. And while I'm finding all kinds of fun little strengths in the Elemental tree (my spell crit is much higher than it ever was, obviously, and Lighting Overload, even though it's not new in Wrath, is a lot of fun), the real standout is the 51-point talent, Thunderstorm.
Here's a spell that does its darndest to focus on two issues caster Shamans have had in the past: running out of mana and getting caught in melee. The name could probably use a tweak (it's more of a Lightningstrike than a Thunderstorm), but the spell effect is great, and while it's gone through a few tuning iterations in the beta so far, odds seem good that it'll come out being one of the best-used tools in the Elemental Shammy's arsenal.