I actually dinged a few days ago but haven't had time to blog about it :)
Leveling was quite fun and fast, very profitable too - I probably made around a couple of thousand gold. In fact even after I dinged 80 I continued doing a bit of questing, just for the gold.
The main spec I chose was Restoration while for off-spec I chose Moonkin (a.k.a. Balance). Having played both a mage and a warlock I can say Moonkin is a very different caster from both, especially when questing/killing mobs.
I was pretty lucky once I hit 80 - between ToC-normal drops, gifts from friends and craftable gear made buy a guildmate (I gave the mats), I was soon decked out mostly iLvL 200 gear, with my weapon and trinkets being notable exceptions. Since then I have joined a guild alt run to Ulduar-10 where we cleared up to (including) Auriaya. From this run I got a very nice head item and ring. I also did a ToC-5 Heroic run where I got a nice necklace. Lots of stuff to enchant and gem but I'm not complaining, makes me a better healer :)
Healing certainly does feel very different from Priest healing, I'm not quite sure I have the hang of it yet but I know I'll get better. At least I don't think I messed up too bad in the guild Ulduar run :)