I want to get inscription on my main toon, a healadin, as I already stated I would be the guild scribe (well, in the sense that I'd try to get it asap, others will probably go for it too but haven't been trying to hoard any herbs).
Besides that, just level my alts while I don't have much reason to focus on my main besides getting used to new mechanics.
Sadly, I'm not gonna be getting them to 70 before expansion comes out (shoulda focused on 'em earlier, damn the siren call of raids!). I have 5 alts and they're all between lv 8-14, with the exception of the level 21 shaman.
Since I want to level them all at roughly same time, I'll be lucky to have them all past 30.
But yeah, my plan is to just switch from day to day between each toon, giving each 4 days to build up a little bit of rest time. Not gonna worry about professions or BGs, and the only times I'll be doing instances is if one or more of my lv 70 friends wants to run me through one.
Once WotLK comes out, I'm going back to near-full dedication on my main, getting it to level 80. After that, back to alts unless a raid is happening, or maybe dailies since they'll be new and hopefully not boring and stale like the level 70 ones have become by now.