Ok - I looked around and I don't think I see anything that's applicable to my question. I was logged in to my first blog (http://yourwishlist.wordpress.com) and then, forgetting that I was logged in, I created a second blog. Then, to my happy surprise, I learned that this second blog would be grouped with the first one - and when I visit the wordpress home page, I see both listed in my sidebar.
I believe I was told to use my first username and password to access it as well (http://audition.wordpress.com). Well, when I go to http://audition.wordpress.com/wp-admin/ and login with my yourwishlist.wordpress.com credentials, it looks like it works, but then I'm redirected through a bunch of pages to my yourwishlist.wordpress.com/ admin area, and it doesn't look like I can post to any blog other than yourwishlist.wordpress.com from there.
Does this make sense? Am I logging in with the incorrect username/password? Incorrect location? I didn't receive a password/activation email with this second blog creation, so I figure it's probably simply something I'm neglecting to do.