Actually, you don't need to go feral to level as typical with solo druids because you can x5 one-shot anything regardless of gear. My boomkins are now level 61 and I FINALLY replaced some lvl 28 boots I got in Gnomer!!

Anyway, I've been experimenting with the Panzerkin aka Chicken Tank. I keep my one moonkin aura and the other four heal. I have been planning to turn one into a tree possibly if I lose too much dps by having all 4 heal instead of just needing one good heal. One thing about the panzerkin is that the synergy with the other four is awesome. And so far I've been tanking pretty well in instances with my guildies. The problem with panzerkins is that they are hard to use and take a lot of skill - no taunts + mana problems. However, I found a nice fix to the typical mana problems: x4 rotated Innervates!

A few of us are trying the x5 druid, keep us informed how you come along.