Since I already wrote about the high-level stuff in the first part listing, I'm just going to point out some additional things I think may be important.
I'm pretty sure that Aki is not a real character in Momoi's past. She's more of a personification of all the people who gave Momoi advice during her early years. Because of this, she's an interesting character to watch for. For example, jealousy she felt is probably real, to some degree. I'm sure not everyone felt that way, but some may have.
First commentary track is somewhat helpful in reinforcing some of the abstract themes, but the second commentary track is much more entertaining. Hatsune-chan is pretty wild.
By the way, if you keep going to the right in the main menu and click on the peach mark, you can transform the menu. This applies to the first half DVD as well. The transition effect is pretty neat.
And finally, if you purchase both limited edition DVDs + Songs Best Album w/ DVD, and send in the application form with proof of purchases, you're supposed to get a special DVD. There is no additional cost other than the cost associated with a stamp (84 cents for me!) I assume I'll get mine since it's run by Avex Mode. Oh, just so you know, if you're thinking of buying these for that, it's probably too late. I think the deadline was end of March. Maybe you can still make it if you live in Japan.
A publication company. Unfortunately, all those LCD monitors don't belong in that time period. Oops!
Remembering Momoi's first publication. Not sure where cross-color distortion comes from.