There are trainers there for first aid, along with the priest and paladin classes. I visited there often when leveling my priest.
I'm just starting heroics; are they all relatively equal in terms of difficulty, or are some easier than others?
Honestly, they're all challenging in their own regard. Try to go with a guild group first, or else you'll be so put off by your pugging experience, you might not want to go back. The worst heroic, in my opinion, is Grim Batol. I've only done that once in a PUG, and only twice with guild groups. If there's not the right DPS composition or people just overgear the damn place, you can be screwed on the last boss. Not to mention the other handful of bosses that all, for some reason, make standing in fire a very challenging thing.
Any plans on making commentary viewable on the mobile version of the WoW Insider website? I know when I am at work in the morning I would love to participate in things like the Breakfast Topic ... but switching my phone from viewing mobile versions of websites to their full version just to post one comment can be a real bother.
It should work. Point your phone to i.wow.joystiq.com, and it'll load up the mobile version of the site, complete with comments. I use that just about every day.
Will Blizzard ever implement the upgrade to the 16-slot backpack? I seem to remember there was talk at one point that the 16-slot backpack would scale with level and increase in slots.
Blizzard's talked about wanting to do it before, but we've heard there are technical limitations to it all. At this point, I think there's more they can do than rewrite seven-year-old item storage code. Things like tabard storage and more prolific mobile bank access are easier to do.
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