Yes, absolutely, though it depends on the boss. Some bosses, like Anub'arak, would be nigh-impossible with a group composed entirely of druids.
"Still looking for an answer to the kodo mystery - warm blooded mammals, cold blooded giant riding lizards?"
Definitely lizards. There are kodo palette-swaps in Durotar called Thunder Lizards, for example. You're riding what amounts to a big ol' friendly stegosaurus. Minus the spiny things, of course.
"What's up with Balargarde Keep? It's just sitting there with all those closed doors out in west Icecrown and a big horn on the top. Yet another in the things that might have been?"
Nope, it's involved with the Bone Witch questline, and it's actually pretty cool, though I won't spoil it for you. You can get the quest chain by completing the Shadow Vault quests first.
"When 3.3 came, raid members who have an assist are no longer able to call Ready Checks. Was this something done intentionally or a bug, and if its a bug is there any indication that they plan to fix it. It can be very frustrating as Tank when you're not the party leader and you have to wait or ask for a /readycheck."
Just a bug, and one getting fixed in the 3.3.2 mini-patch coming soon.
"I read some weeks ago that heirlooms don't work for 80+ but do they still work as normal to lvl80 when Cataclysm comes out?"
Blizzard says yes, though we'll likely need to wait and see exactly how it goes. There are plans for new heirlooms in nearly every slot; some crafted, some purchased, and we don't know what levels they'll affect just yet.
"Any plans to revive Ask a Lore Nerd?"
Nope, it's basically been rolled into The Queue. You'll be seeing more lore content on the site soon, though, as soon as we get our new lore columnist contracted and ready to go.
"I am having an extremely hard time finding a CURRENT guide for Balance Druids. Everything is for either Resto or Tanks. Also most guides are a year or two old."
You'll be seeing plenty of regular moonkin content here soon, as the pre-eminent moonkin Murmurs has joined the WoW.com team. He'll be putting out a special Balance edition of Shifting Perspectives.
Have questions about the World of Warcraft? The WoW.com crew is here with The Queue, our daily Q&A column! Leave your questions in the comments and we'll do our best to answer 'em!