Hrm... I haven't posted in a long time. Ooops.
On Dual specs:
Right now I'm specced Disc/Shadow. It's very nice to be able to do my dailies in less than a bajillion hours then be able to heal a heroic/raid without batting an eye. However, I'm thinking about changing my shadow spec to Holy... because I really like healing, and this would make me like... the Superman of all healers.
On Priest stuff:
I'm very excited about the different priest changes, despite the mana regen nerf (which I have felt, but still not even enough to like... use a potion... or a shadowfiend... or even an arcane torrent). Disc became even better, and Holy suddenly became very good. I was very unimpressed with some of the changes that happened in 3.0 (For example: Holy concentration and Serendipity). The newer versions of each, however, are vastly superior. I'm in love. On a Shadow-note: Critting dots makes me feel strange.