I had my third adjustment today! Here is what happened:
The ortho said that my upper arch has expanded and leveled out nicely, and it has basically expanded as much as they needed it to. Here is a pic of the upper arch:

So, after 3 months with the same wire, it was finally time for me to get a new one! This new wire is more square in shape, and he described it as a 20/20 wire, which refers to the gauge I think. The hygenist told me that I'll have some tenderness over the next few days, since this wire is much stronger than my old one, but she also said that "things will really start to happen now", which was nice to hear!
Here is a pic of my teeth that I took today (notice the bigger top wire and the purple ligs!):

The hygenist also put some little gadgets on my top back molars to keep the new wire from slipping...they are poking my cheeks a bit, so it's a good thing I have some wax! Here is a pic:

They still can't seem to fit the lingual arch back into my bottom jaw, but he said that things are still rounding out and moving along, and that I will probably get a new wire on the bottom next month:

So, overall I'm pretty happy with how things went! I'm getting a little annoyed with my lower arch, but I know that I just have to be patient and it will come into place.
Just for the sake of comparison, here is a pic from my first day in braces:

And here are two pics from last month:


(click on the images to make them bigger)
My next adjustment is August 17th!