One of the cool things about shammies is that they can be ele specced and still do a reasonable job healing when needed.

Even cooler, imho, is my 70 druid, who is dreamstate resto specced (as Vyndree suggested). This is a pretty unique and cool spec because he can be a primary DPS and do very well (silmiliar to an ele shammy), OR switch to healing gear and heal heroics. With no spec changes, he has been tops in Kara groups in DPS and has been tops in Kara group in healing.

If you do go multi-druid, make sure at least one is dreamstate resto.