Alts are awesome, and this expansion it seems everyon has a billion of them
My main is a prot paladin. For my playstyle, he's hands down the most fun I can derive from the game.
80s alts : Boomkin, Resto shaman I'm thinking about switching to Elemental and Arcane Mage. Thing is I've recently changed servers and factions on main, and so far only the mage has made the jump too. So I guess he's the one I have most fun with. I'll probably port shaman next, then druid which will become a bear/boomkin down the line. I love the mage, he's my favourite alt these days.
Hunter at 60 is bored. She hit 60 the day before WOTLK came out, hasn't done anything for a whole expansion.
Lock at 29 on wrong server will get deleted at some stage.
New rogue at 20 is looking good for the time being. I'm enjoying playstyle, but the lack of "disengage + heal" option is frustrating at times. Out of my 4 80s, 3 could heal themselves, and that's really cool when suddenly more mobs run into you. Also, no AoE yet, looking forward to FoK or whatever comes along.
New priest, rolled today, at 6, we'll see. I'd love him to be my next 80, but I have little hope he'll make it, though I'd love him to ...
DKs ... I dunno, I can't get into them, no DK for me for the time being.